Just because a simulacrum is made of ice and snow does not mean that is it's "true form".  Reading simulacrum,  nothing mentions true seeing.  Only thing it mentions is a disguise check to determine how accurate a copy it is. That still doesn't nessessarily say it's a simulacrum,  but that it's not the person.<br/>Not everything in the illusion school is subject to true seeing.  Just like not every enchantment is mind affecting.<br/><br/>I'm not sure how you rolled a spot check of "yes". Either.<br/><br/>Vholdran is probably using a scry power that permits true seeing.  Some do.<br/><br/>Nothing in the simulacrum description says it's not alive.  It not a construct<br/><br/><br/>Edited:<br/><br/>Methu may be underpowered if you dont plan to abuse create spawn. (If you do you're up with Echidna and Nyag'thon) Anasil on the other hand is one of the most powerful characters in the game. Looking at every character sheet we have four characters that stand out to me as being exceptionally powerful, she's one of those four.  There may still be cause for complaint at ones power being negated so simply.  Not saying you don't have a point at all in worrying about "not technical immunity" showing up all the time.  Magic items and spell buffs have their own counters though where innate blanket immunuty (something you outright negate) doesn't.  If out super size group is sticking together we have a lot of powerful support characters who are designed with that kind of problem solving in mind. If we are a more connected set of multiple personal threads than you've got more reason to be concerned.