Specialflag 1: death -> fail
Specialflag 2: escort/wave of mobs -event
Specialflag 4: areatrigger related (like visit certain place=areatrigger)
Specialflag 8: basic speakto. NOT needed if srcitem=reqitem(deliver), or if spells needed(, or ender in different map?), or if escort-style event. + many other exceptions :/
Specialflag 16: not used?!
Specialflag 32: epic class quest... for hunter
Specialflag 64: raidlike team needed, nothing special here i think. lore related somehow?
Specialflag 128: tbc
Specialflag 256: no idea. hundreds of quests have this, but I can't find anything in common with them
Specialflag 4096: daily