In Titan Quest, i play a Diviner, Spirit + Dream class. I am mostly interested to something Nercomancer-like (hence spirit), so what is the closest Grim Dawn class to that?

Warlock (Occultist + Arcanist) is the closest thing to Necromancer. I just finished game on normal with that class.

Thanks!!!

I would add Nightblade+Occultist, Nightblade provides cold and poison, which also theme of necromancy.

I believe crates first expansion will have a proper necromancer.

In wait of that though i would suggest Druid actually; as it seems to have more pets, but I've heard NOTHING is a good necromancer yet because at most the skill based No. of pets you can get is at most 5 and most will be time out affairs (which is particularly crap).

If you want an equivalent of bone spear take soldier and cadence as at level 5 in soldier cadence can get a piercing quality.

As I've been using it I've noted it doesn't just pierce through a single enemy to hit the one behind, i have only a single point in it and it would seem each enemy hit has a repeat chance for this piercing shot to go through to the target behind.

My best shot so far seems to be 5 enemies hit from a single shot.

Also the druid class has a thorn equivalent of bone prison from my reading of the skills.

When you consider that all elemental forms of damage are essentially a varied form of +Magic damage% countered by specific +Magic Damage resist the only thing you require to simulate poison effect is Damage over time (which is always stupid to choose when you have the ability to do the same DPS with direct damage).

D^T means others can kill steal, if it's not AoE your not effectively doing any more damage (take note trying to manually effect groups without an AoE form is frustrating due to crap targeting), and lastly if it were to be effective it would need to have an extremely long lasting time and you would constantly need to run away and wait it out to use it effectively (game becomes slow and boring).

Is it ground stomp? I found that to be pretty useful when it comes to mobs.

Ah, that's lightning nova. Pretty nice as well, but ground stomp is better. Posting stats for comparison.

Ground Stomp
38 Energy Cost
12 Second Skill Recharge
4 Meter Radius
30% Weapon Damage
161-288 Physical Damage
80 Internal Trauma Damage Over 2 Seconds
25% Slow target For 3 Seconds

Lightning Nova
38 Energy Cost
4 Meter Radius
18% Weapon Damage
22-108 Lightning Damage

Wait, you can bind skills to mouse? Also I missed the cooldown thing, better equip my mace with lodestone then. It's better to hit with both, I guess. Thanks for the tip! :)

Extra question: what level were you when you decided to add the second class? I'm up to L28 in my base class and still haven't added a second. I wasn't having any trouble surviving with Occultist only and wanted to get my raven and hellhound up to 16 before doing much branching out. Just wondered if most people hybridized at L10 or waited.

Heavily depends on classes you have in mind for final build.
Most of them have one-point-wonder at 1-10 points investment, which worth branching in.
For example, as pet user, you get more punch by getting shaman tree with Briarthron instead of raven.
So, the most common thing is going
"max your main skill"
"At level 10 get "wonder" from another mastery" (Blitz from Soldier, Pneumatic burst from nightblade, Curse of frailty from occultist, mirror of ereoctes from arcanist)
"at approx 2:1 ratio upgrade your main and secondary mastery".

Yes, I was thinking Conjurer (Occultist+Shaman) was my best bet for the way I started off. I'm starting to get enough constellations filled to really help the pets. Of course, strategizing the constellations is a whole other topic. I do like the extra layer of tweaking it gives.