I am building a 10 Druid / 30 Shifter. The focus is on outsider / construct. My build takes up to great wis 10 in epic levels. My question is, how much would it ruin the build to drop 2 great wis feats to take undead and dragon as well. I don't mean taking the LFF feats for them, just the base ones. If my calculations are correct, I would lose 1 DC to all abilities but gain a LOT of versatility. Granted those shapes won't be of much use in hells+ but for things like sissy etc it might be nice to be able to use baelnorn etc.
You'd lose a subrace tier worth of DC for everything - what will limit your efficiency without adequate support (bard cleric).
On those non-LL shapes, for LL content your DC will be too low, because those feats are what make shifter DC comparable to other casters at similar level.
Adequate leveled enemies have like 25% chance of failing a saving throw at an adequate level without cleric and bard. On those cases, that -1 would bjng it to 4 or less (20%). Without the +9 DC from legendary form focus you'll be literally fishing for 1.
On top of that undead shape requires legendary form focus to get the most useful abilities. While dragon breath low DC would make it useless again enemies with evasion. Wyrm breath is more useful in that case.
Outsider construct combination has a good damage type coverage. Elec - Marut Fire - Azer Cold - beholder and raksha Sonic - raksha Acid - Slaad Positive - Cristal golem and mordron Negative - beholder Physical - manticore and stone golem Magic - Slaad