THis is what Tymrik looks like after his own death.
Trymik
5th level corrupted Goblin Thief turned Ghast (Undead)
Hitdice: 8d12+3 = 68
Initiative: +10 (dex +6, improved iniative)
SPeed: 30
AC: 25 ( chain shirt +4, dex +6, natural armor +5)
Attacks: Bite +10 melee ; 2 claws +5melee; or dagger +10 ranged
Damage:Bite 1d8 +3 plus paralysis; claw 1d4 +1 plus parlaysis; daggers 1-4 +3
Face: 5x5
Special Attacks: sneak attack 3d6, stench, paralysis,
Special Qualities: Posion Immunity, Fear Immunity, Darkvision 90 ft, undead, +3 turn resistance; can cast shield spell 1/day
Saves: Fort: For +1, Relex +7, Will +6
Abilities: str 16, dex 22, con -, int 14, wis 14, chr 16
Skills:56 max=8
Hide 8 +6+4-2= 16
Move silently 8+6+-2= 12
Spot 8+2= 10
Bluff 8+ 3= 11
Disable Device 8+2= 10
Climb 8+3-2= 11
Escape Artist 8+6-2 12
Feats: Improved Initiative, point blank shot, alertness, toughness, weapon finesse (bite), multiattack
CR: 8
Stench and paralysis as per MM but with DC (17)
This is what happened:
Last week I ran the prototype (Tyrmik the goblin thief) against the PC's and they killed him (mostly my fault he should have been able to het away). They promptly took all his MAGICAL equiptment and buried him.
The following night Tymrik rises as a ghast to continue to follow the order of his Demon lord.
This is what I did:
Made type into undead
Changed hit dice to d12 (kept the % of hitpoints per die; essentially removing the COn and doubling the hit points.)
Modified all saves, skills, attack, damage, and ac modifiers by adding the Ghast ability modifiers to his orginal stats.
Kept previous feats and special abilities and added all the ghast ones. I bumped up the turn resistance becaus eit seemed appropriate. I removed the goblin bonus to his skill points ( +4 to hide) but did not add ghasts "racial" bonuses because I didn't want to spend an hour figuring it out.
Now the questions:
In theory, whatever that means, is this a logical progression?
What should the CR be? ( I think probably 8)
DId I miss anything?
Thanks in advance.
(Edited after following Monte Cooks guidelines)