You're not supposed to. The game makes sure you don't, because the quest objective doesn't say "you beat the legendary Xan" or something along those lines. You're not supposed to beat some bosses, at least, not then.
Edit: I believe you mean Sepulchure and Fluffy are undefeatable, Xan outside of the war (in the War Shrine) is defeatable. In that war quest he is not suppose to be beat.
There is no Pyromancer class in Dragonfable, the closest you can get is when you play as Xan during the Fire War.
The fire orb is unobtainable in the game, even after you managed to defeat Akriloth, Xan and Xan's apprenctice (who's name escapes me)
to his tent in warlic,s zone by gyphon
go to the southern side of falconreach and go left then talk to xan
Xan can not be seen outside the quests involving him, so for example, Fire War, the Lymcrest chain (From Warlic), and during the current war in Orb Of Ice.
there is 1 called brother's blood, and if you can find xan in falconreach, you do his powerful challenge.
You have temporary access to the armor during the Fire War quest Help?. Outside of that quest there is no legal way to get the armor
Well you can't even kill the dragon guarians.
Xan Cassavetes goes by Xan.
Xan Spencer is 6'.
I have a TON...Xanadu xanth xanthan-gum xan-thate xan-thene xan-thic-acid xan-thine xan-shine xan-tho-ma xy-li-dine xy-lan
do the lymcrest labrynth and kill every body