thealienguy: Firstly, how did you get there with a fresh party?
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ZFR: How do you go there straight from Harmondale? The portal won't work unless you go to Land of the Giants "normally" first and activate the portal there.
After arriving in Harmondale I'm looking for Wind Master and Gate Master to hire in order to be able to fly and use town portal.
Then I'm going for a moment to Baracada Desert to collect some ore and create some armor to sell for some gold.
Then I'm getting 3 invisibility scrolls and the journey begins.
From harmondale I'm traveling south to Barrow Downs and enter Stone City.
Then I go down to the mines and clear them from the Tryglodytes.
Before I enter Nighon Tunnels I cast invisibility on the party and traverse them unseen to Thunderfist Mountain and gout out of it in Mount Nighon.
Then after casting invisibility I again enter the Thunderfist Mountain and go into Tunnels of Eofol from which I exit in Land of the Giants.
It is mostly the route from this speedrun:
https://www.youtube.com/watch?v=LxPKyf3cCi8 Then I think, it seems like somethings must be triggerning this well in order to work.
(It is wrong guess, because it works in the speedrun.)