Methodology on how it is done
here.
Ok so i have a high level Psion that has hijacked a new body, namely the Tarrasque. This is nothing new for him as the party has found out the guy has done this for hundreds of years to gain a form of psudo-lichdom.
I need to finally stat this guy out and get him ready as the party is approaching fighting him soon. 3 of the 4 will each have a special item to help fight it as well, these were used to defeat it in ancient days. The warblade will have the Blackrazor from return to white plume mountain module, it will replace the need to wish it dead and ignore the DR in addition to its normal abilities. The wizard will have an orb that will act as a focus reducing his metamagic costs by 1 and allow him to ignore its SR. The druid will have bracers that provide regen of 5 always subdual like big T and makes all of their attacks deal normal damage to it rather than subdual.
Facts the party knows about this guy/ things that need to be in the build:
1) telepath with mind switch
2) has leadership with a Wujen as cohort. Highest level follower is elf using Eternal blade PrC from ToB
3) he has been using several mines of adamantine and diamonds to finance his efforts and to provide him help in binding T until he is successful in transfer.
4) hundreds of years old, gains the aging benefits but not sure how multiple lifetimes works with that.
5) 32 point buy for stat generation, just like the party.
Most anything goes on this guy as he will end up being the final fight of the campaign, most likely anyway. More details about the party:
c1) Dwarf Warblade: focuses on power attack and critical with 2 handed weapon, now blackrazor. Loves to use WRT and Mountain hammer series. Most equipment is geared to gain str and con.
c2) 1/2 elf Druid going into Daggerspell Shaper. has quarantine daggers. wants to use wild shape as primary combat form and like ranged touch spells, splinterbolt and ice lance. Bear companion right now but that will likely leave as it will just get itself killed soon. Only healer in group.
c3) now kobold wizard. transmutation specialist with Mage of the Arcane order as PrC. Co-DM running this character, to get this guy ready to run his own game. Reincarnate was the only way to get people back for a while so entire party has changed race at least once. Loves to enlarge or polymorph the party. Mostly BF control right now as the trans. won't benefit them as much.
c4) my character Human Psion/Crystal Master. I have a thread around here helping with build. Short version is rechage between combats and use ACs to help the party and crystal shard to blase, NRG/Ecto walls for BF control, and NRG push for putting them back where i want them.
I really want this to challenge the party with out devastating them. They should have a good chance at both victory and loss. I also want this to be kinda easy for me so i was thinking of essentually doing the BBEG as a Gestalt Terrasque//Psion with out making him go beyond level 20 psion. I could level him further if needed but don't want to get to him using epic cheese to dismantle the party or making him unrealistically so he wouldn't use what is available to him either.