Savlin investigates the iron door, finding it to be unlocked and apparently untrapped.
Directly in front of it is a symbol in a foreign language. A quick check by others reveals similar symbols in front of each of the other doors.
Time seems to be passing far too quickly as you decide which exit to take...
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Aasimar are common enough, but to recognize the differences between one and a normal human (which they resemble) will require a spot check, DC 15. (You can take 10 if you have cause to 'investigate' the twitching, paralyzed man).
As for the symbols, they are in each of the 'elemental' languages. Who can read any of those or make a decipher script check?
BTW for the most part, please make your own rolls on Invisiblecastle and link them. I'll roll for you when it's reactionary and the result is required for me to tell you what's going on (Such as saving throws or spot checks vs hidden monsters).
Good call on the search check though, I will also be rolling those so you don't know what you got (Nat 20 means you probably found everything there is to find, Nat 1 means you're boned, etc)