Well ppl, as the topic have-infravision-actually-do-something was turning in a tarrasque chances of implement, i decided to bring this discussion to a new topic, so we don't spam the objective of the old topic.http://forum.baldursgate.com/discussion/823/have-infravision-actually-do-something#latest
The problem with tarrasque is that you can't just kill him as you normally would... if i remember correctly, in order to kill him in AD&D, first you had to leave him with less than -10 hit points, then you had to use a wish to prevent him from ressurecting, since tarrasque has an absurd health regeneration... there could be another things involved, but i don't remember them
but in my opinion, it would be awesome! i just don't know how they could fit him in the game...
Imprisonment to him, so. Maybe destruction spell (Clr 7, death 7, repose 7) as it makes the user consume the body of the killed being (really don't want to know what would happen to someone that consumes tarrasque's remains), no specific immunity to death spells on tarrasque data base until now.
If that don't work, maybe a plot kill, where the main char make a deal with a deity to use Hand of Death divine ability on tarrasque when his life is low.
Even being a huge problem (in all senses) i feel that we faced so many ubber things in Baldur's Gate/BG2 that i don't think tarrasque would be so much to the main char (Tons of elder dragons, demi-lichs, demogorgon avatar, the actual mistress of murder with some limits on the fight thanks to "Solar").