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Corrupted: Encourage Experimentation/Tempt

Redeemed: Encourage Resistence/No Tempt

Two main endings (corrupted and redeemed). Only the redeemed ending gives a new achievement, rewarding a Tonic that converts Corruption into extra stats in battle (only lasts a few expeditions). However, two glyphs can be gained early on costing essence, and an additional item in a more recent patch related to the Slime. Corrupted Torgar also give a unique buff that stacks five times with each encounter, but is easily overshadowed by other, far more powerful and exploitable buffs. Encountering Corrupted Torgar five times (getting the max stack) adds him to your party, and Redeemed Torgar is recruited in the next encounter after he's redeemed.

To be honest, he's perfectly skippable after doing the redemption path, though encountering him at least twice is recommended each reset thanks to the glyphs and the extra item related to the Slime (the latter can be purchased alongside the other glyphs for cheap, but only then). As a party member... he scales poorly after several resets, even with the new level upgrades added in recent patches that boost party stats. As far as I'm aware, only Kanathar scales well, since you can give him essence to boost him directly, though one of the new teammates (the before mentioned Slime) seems to have some potential.

Basically, have him “resist the urge” every time you encounter him after he breaks his canisters, and when he finally fights against it, stay back. Visit him after this and he’ll join your party.

Doing this eventually unlocks the achievement that gives you a special tonic that uses your corruption rate to boost strength for five expeditions.

Of course, you could also keep tempting him to corrupt him fully. Once done, beat him five separate times to recruit a corrupted Torgar. Personally, I only bother to have him reject the corruption only once for the tonic, because an uncorrupted Torgar’s stats are ass. Corrupted Torgar isn’t much better, but at least he gives you a buff to your stats with his special trait, similar to Adel’s Timeless Bond. A maxed out Sub-Kanathar (the Imp) is honestly busted and can destroy almost every enemy in the game by himself, though I’ve yet to test on Nyx (the true final boss), because I can’t figure out how to get a non-corrupt eye to do the fight.