I need to clarify a few things.

Once you exit through the portal, the game is effectively over. You cannot attack other adventurers on the other side as that would be unfair on those who see their game as being done for managing to escape. If you wish to roleplay a bit further in your new surroundings, that is fine.

The portals are not visible from the other side otherwise anyone could just wander into the dungeon. As such it is not possible to sabotage the portal from the other side.

Position wise, the adventurers by the trapdoor are closer to the portal than Tridris.

Tridris is both a Lich plus also has one of the artifacts of power embedded in his chest. He is more than capable of levitating and turning invisible.
That does not necessarily mean he has a clear path to the exit. The dice shall decide that.

No Goblin mischief outside, then! :P
Well, time for a beer, a giant ratburger and some spirit appeasing left behind during the last days.

Godbran Helloburger the Halfling Thief is relieved to be on the other side, finally. He addresses Fognino and Cardan:
"That went less smooth that I intended but better to lose a boot and some skin than the important stuff from the neck up if you know what I mean.
Let's look for a tavern and the first round is on me!"

Gold - Goblin Ranger after finally having crossed the portal breathes the fresh air and observes this new environment and decides to take a path to the hills in search of something good to eat.
Well, this great adventure made i very hungry.
Before going your way, Gold thanks to Fognino and his companions for clear a path for me to cross the portal.

I wonder if somebody will find a way to trap the Lich. That would be an unexpected turn!

12 - Garethianopolisian - Half Orc Ranger - Deceased

Me haunts the battlefield

Thanks for the vines:p Escaping was so easy that we only needed one more obstacle!

Ok, I have sort of a plan. I will distract the enemies that look at us, I have Divine Retaliation in case I get attacked. There are vines between us and the portal. I asked Doc and he replied that the meteor spell Valius has will disable them. Thelis can try to charm a big bad orc with his ring to help us. I can also Summon Holy Guardian to attack the other orcs that head towards the portal. Calad will do his thing. And we move too this turn, you close to me for the globe of protection effect. How does that work?

It seems really strange nobody ever called me out on that, but... do you realize I'm the guy who first posed as the enemy and used the occasion to clear his way by sending the whole Orczilla horde against you? :P
Even before, I left you alone fighting rather than helping and went on to loot the Ogre's camp profiting from the confusion.
I'm a Goblin. I'm mean and sly.

If some of you doesn't manage to escape, at this point it's probably my fault!

Ah, outside.... now time to start big Half-Orc family!

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Now that was a lot of fun, thanks Doc for coming up with this! I started reading what the others did too in the other tunnels and passages, and a big thank you to Benkii as well, reading his updates really makes it easy to read the other adventures

62 - Thelis - Human Ranger uses his Ring of Charm Monster on the orc nearest to the trapdoor entrance. If the charm is successful, then he'll command (if this is possible) the charmed orc to attack the orcs and goblins near it (maybe this will make enough of a distraction for the adventurers to slip by the monsters).

Thelis will stay close to 44 - Franziskan - Human Cleric under his Globe of Protection, with the short sword and the dagger ready to attack any enemies that may come too close.

With the gleam of gold catching his eye, Valius watches the scene unfold in this new chamber: A portal surrounded by vines and orc mages, a giant Orczilla surrounded by even more orcs, trolls, hobgoblins and ogres, and the brief sight of the Lich he saw transform earlier go invisible.

"What a dungeon I had to enter. I probably should have stayed in that main chamber. But that pile of loot..."

Too late now for regrets. Getting out of here is paramount and the first thing to do is get through those vines. Dropping the veil of his Invisibility spell, Valius raises his sword to the heavens and cries out: "I cast Meteor Strike!"and watches the flames fall from the skies onto the vines and any foe that was unfortunate enough to get caught beneath the flames. Once the vines are burned away and the way to the portal is clear, and if there's enough time, Valius decides to race to the right and grab a handful of gold while the orckin are running in fear from the brief glimpse of the Lich they saw. He didn't come here to leave without some gold, after all. If Valius can do this safely before getting noticed by any enemy, he will recast Invisibility on himself and then race to the left towards the portal and jump into it, finally escaping the dungeon, but if any enemy notices him first, he will use his Amulet of Slowing on the closest enemy that approaches him before continuing his run toward the portal.

Valius, Elven Battlemage
Spells cast: Meteor Strike x2, Detect Secrets, Ray of Stupidity, Magic Missile x2, Invisibility since turn 10
Items found: Amulet of Slowing

What is this madness going on here? A monster farting orcs? Disgusting! And look at that ridiculous half orc who's dancing and chanting, oh wait that's Pater Alf! Heyyyyy, there's the portal! But there are a lot of obstacles. I hope my friends do something smart because I don't see how we'll get through these vines. I disregard the orcs who look up high and turn to the orcs and goblins who look at me. I take out one of the diamonds I got in the room with the salamander statues and show it to them saying "Diamond! Catch!" and I throw it to roll on the ground towards the weakest looking goblin. I cast Summon Holy Guardian at the edge of the vines and order it to attack those of the horde that go towards the portal. After that, I move towards the portal keeping myself between enemies and my friends. I want to protect my friends by being the first target for a melee attack even if it costs me my life.

Franziskan Human Cleric
Globe of Protection, Divine Retaliation

Current Situation:

2 TURNS LEFT TO ESCAPE

Orc Breeding Room (Orczilla! Boss Fight):
Fognino, Cardan, Godbran Helloburger, and Gold have escaped. Garethianopolisian died valiantly fighting the horde. Pater Alf pretend to be a part of the horde sneaking past them. Orczilla starts screeching at Pater Alf and pointing towards the portal where some of the adventurers have escaped. Some of the horde are starting to head back towards the portal, alerted by Orczilla's noise. The Lich Tridris levitates over the horde toward the portal.

The Secret Trapdoor
Calad, Valius, Thelis, and Franziskan make their way to the end of the tunnel and push up on a trapdoor. It crashes open, there is a startled cry, and a spear jabs down at Franziskan but is deflected away by his Globe of Protection. It appears the doorway led the party to the Orc Breeding Room. On the left is a glowing portal. On the right is Orczilla. Several orcs and goblins are around the trapdoor entrance, some panicked by the group's sudden appearance, others scanning above looking for the levitating Lich. the adventurers by the trapdoor are closer to the portal than Tridris.

Current Actions Summary

12 - te_lanus - Garethianopolisian - Half Orc Ranger -- DEAD
(Head bashed in. Can possibly be revived.)
Me haunts the battlefield

18 - Cavalary - Calad - Elf Mage -- ( Reflect Spells, Levitate, Invisibility )
With the portal safe to remain open, after spotting Tridris attempting to levitate invisibly through, Calad smirks wickedly, quickly whispers something to his companions and staying behind his companions and inside the Globe of Protection a moment longer, he uses the Ring of Boulder Smash to drop a huge boulder on Tridris, well before the Lich gets above the trapdoor. The very next instant, not waiting for the outcome, he uses his Ring of Teleportation to teleport through the portal.
Since the Ring of Teleportation allows instant teleporting to any place he can see, and the portal allows seeing through to safety, no need to spend another second in here. It may be interesting to see what the boulder did, also considering Orczilla may be underneath it as well, and/or that it may at least block the way of some other enemies to his companions, offering them better chances, but safety first, so the rings will be used immediately one after the other, teleporting to safety immediately after dropping the boulder.

17 - Trid - Tridris - Drow Necromancer -- LICH -- ( Death Armour, Magic Shield, Reflect Spells, Reflect Missiles, Invisibility, Levitate )
I'm levitating to the portal so I can exit... If my Invisibility will somehow be broken (even be me) and I have time I will cast Mirror Image. Now...
1. If there are still vines on my way and they can get me through my Invisibility I'm casting a Meteor Strike on them to burn them ( I heard it will work).
2. If I get attacked be someone I'm casting Web and Grave Mist on/near him...
3. If I somehow get mixed in someone else spell I'm getting angry and look point 2.
4. If I somehow got surrender by other things or blocked from the portal by monsters I'm casting Wail of the Banshee so I can get through, if it's not enough I'm using Summon Monster/Raise Corpse and using them as a meat shield so I can get through.
5. [*] just to be sure.
Whatever happens leaving this place is my priority, I didn't went through all this hard work to get the artifact just to stay here forever.

62 - ariaspi - Thelis - Human Ranger
62 - Thelis - Human Ranger uses his Ring of Charm Monster on the orc nearest to the trapdoor entrance. If the charm is successful, then he'll command (if this is possible) the charmed orc to attack the orcs and goblins near it

31 - blastradius - Valius - Elven Battlemage
Dropping the veil of his Invisibility spell, Valius raises his sword to the heavens and cries out: "I cast Meteor Strike!"and watches the flames fall from the skies onto the vines and any foe that was unfortunate enough to get caught beneath the flames. Once the vines are burned away and the way to the portal is clear, and if there's enough time, Valius decides to race to the right and grab a handful of gold while the orckin are running in fear from the brief glimpse of the Lich they saw. He didn't come here to leave without some gold, after all. If Valius can do this safely before getting noticed by any enemy, he will recast Invisibility on himself and then race to the left towards the portal and jump into it, finally escaping the dungeon, but if any enemy notices him first, he will use his Amulet of Slowing on the closest enemy that approaches him before continuing his run toward the portal.

44 - Zadalon - Franziskan - Human Cleric -- ( Divine Retaliation, Globe of Protection )
I disregard the orcs who look up high and turn to the orcs and goblins who look at me. I take out one of the diamonds I got in the room with the salamander statues and show it to them saying "Diamond! Catch!" and I throw it to roll on the ground towards the weakest looking goblin. I cast Summon Holy Guardian at the edge of the vines and order it to attack those of the horde that go towards the portal. After that, I move towards the portal keeping myself between enemies and my friends. I want to protect my friends by being the first target for a melee attack even if it costs me my life.

6 - PaterAlf - Pater Alf - Half Orc Warrior
Me continues to act like I'm part of the horde and try to get closer to the portal. If there is a clear path and me can reach it without danger of getting struck by spells from me companions near the trapdoor, me will start running and jump into through it.
If there are just one or two enemies from the orcish horde between me and the portal, me will try to get as close as possible and then knock them out with a surprise attack. Again it's my priority to not get hit by spells (from foes and friends).

Haven't taken turn yet:
7 - Ilan14 - Daniel - Human Thief
27 - Maxvorstadt - Balbok - Half-Orc Shaman
60 - Gekko_Dekko - Daddy Burrson - Dwarf Warrior
79 - v1989 - Vertel - Human - Thief

Me continues to act like I'm part of the horde and try to get closer to the portal. If there is a clear path and me can reach it without danger of getting struck by spells from me companions near the trapdoor, me will start running and jump into through it.

If there are just one or two enemies from the orcish horde between me and the portal, me will try to get as close as possible and then knock them out with a surprise attack. Again it's my priority to not get hit by spells (from foes and friends).

Pater Alf - Half-Orc Warrior