He just disappears, I couldn't hit him and he just whooped and vanished

From what I have tried... if you drop the lamp after summoning the demon, you seem to be able to keep on using it. But, as one would expect, there seems to be yeat another bug on the game and I'm having difficulties using it on the last party member, because he says that I have already used my wish and it isn't so...

I'll be heading back to valeia shortly, to see if a few 1st level characters can help me getting some weapons and armor....

P.S.: Sorry for the terrible english....