[Lava]

You need to provide more information: is that BG1EE or EET? What game version? What mod version? And are you sure you're in the right place? (where exactly did you go?)

The script looks like that:

IF
InParty("L#1Verr")
Global("L#1VerrPashaExist","GLOBAL",0)
THEN
RESPONSE #100
SetGlobal("L#1VerrPashaExist","GLOBAL",1)
CreateCreature("L#1VPAS",[2775.1265],2)
Continue()
END

So as you see, there aren't any significant conditions for him to spawn.