At high levels, all good damage spells have limits.
Magic Missile is limited to five.
Fireball to 10d6
D. Fireball to 15d6
Sun Fire to 14d6
Chain Lightning to 9d6(level 18)
But skull trap is unlimited!!!!!!!!!!!!
Doing some 18d6 (level 18)
Try sequence these spells!!!!

Oh get Aerie to sequence Cleric Spells!!!
Three Holy Smites are great against loads of enemies ambushing you!

are the undead immune to skulltrap because it's necromantic spell. I don't know and therefore ask.

Most Skelton warriors and Liches have magical resistance anyway. I think that undead such as simple ghouls and ghasts should be damaged normally.http://www.tgeweb.com/cgi-bin/ubb/no...les/tongue.gif

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http://www.gis.net/~yos/lichwah.gif
Greetings Mortals. My Name Is Wah, Arch Lich Wah.

Skull Trap is a GREAT spell. It takes a very high magic resist to avoid this one. Liches, Skeleton Warriors, and Iron/Clay Golems are the only creatures that can resist it. Probably need 80% magic resist or greater to avoid all damage.