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Spoilers possible
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Well, you don't need to be invisible at all. All you really need with Tor'Gal is to beat him hard till he falls. You can get him alone without messing with invisibility as well.
What you could do first, is to tell who you have in your party and what levels, that will make it easier. Few tips - if you have Yoshimo in your group, set some traps (or all of them) on the stairs. Once traps are set (special ability Yoshi has, Snares and Special Snares), leave the group in the previous room, but close to the door so that no one could get through the doorway without bumping into your group. Now TURN OFF the "Party AI", to prevent the group members running like headless gooses through the door to charge the trolls. The room I am speaking about is the one where Umber Hulks were in, hopefully you have killed them by this time. Move the weaker party members (casters, thieves) a bit back, make sure they have ranged weapons. You should have by that time quite few potions of "Oil of Speed", let the tanks each take a sip. Healers should ready healing spells (i.e. have them memorized), mage types have some offensive spells ready (i.e. Melf's Acid Arrow, Flame Arrow, Magic Missile, Melf's Minute Meteors, such). Save the game.
Now, move the main char (if he/she is a tank) inside, on the stairs and move him/her carefully further, by small "steps". Eventually Tor'Gal will see you and talk to you, and after that, attack you. Immediately run back to the group and wait there. When Tor'Gal get's close to the stairs, he will get damaged by the traps set there earlier. Wont kill him, but soften up nicely. Now he will run to the door, but he cannot enter the room because your group is there, so he will attack you through doorway. You beat him back with the whole team. Let the casters smack the occasional offensive spell (like Magic Missile and so on), but make sure that the mage will have at least 3 acid arrow or 3 flame arrow spells left, if none of your group has any weapon with those elemetal damages. Trolls can be "permanently" killed by fire or acid. As soon as Tor'Gal falls, shoot him with either acid or fire arrow spell. If your archers have acid or fire arrows, it's easier and you can use the spells during the combat freely.
As for why to attack like this at the doorway - that is in case Tor'Gal wont come alone. If his buddies will join up, at least they cannot attack you too since only one of them fits through the doorway at the same time. So the doorway acts like a "filter" and lets you fight one of them at a time. All this spells are from lvl 1-3, so easily useable. For this you don't need high lvl party, around lvl 10 will do. Tor'Gal will die like any other troll you already met, he just may have tad more HP and hit tad harder.
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