Disintegrate versus Undead:
Undeads are immune to effects that allow Fortitude saving throw unless the effect would affect object. Disintegrate allows Fortitude save partial (object) thus it will affect Undead normally as it would affect table.
Mage's disjunction versus Undead:
Disjunction affects magic items and magic effects and Undeads are neither of those (with certain exceptions). It will remove any spells active upon affected Undead but won't have other effects unless the Undead is continiously sustained by active magic or spell effect itself (for example skeleton summoned with summon monster spell by someone with Skeleton Summoner feat) - being created by animate dead or create undead spells does not qualify - those spells are instantaneous and leave no more lasting magic that could be disjoined than resurrection or heal.
Excuse me for sounding thick but....
The disjuncture would effect all spells in the area wheather or not they were cast on an object/creature/air space?
When used against undead do the undead count as object and the thus entitled to a will save before it effects spells on it? (or will save just counts for items in its possession?)
Undead immune to spells requiring fortitude saves so does that make them immune to disintigrate spells?
Thanks
Thick Tony
You're welcome.
Undead aren't objects, they are undead creatures. Constructs aren't objects either.
They aren't immune to ALL effects requiring fortitude saves, only those who can't affect objects (cf. Bestiary, p305 or 309). And no, it doesn't mean they are themselves objects, it's only the definition of their immunity! As disintegrate CAN affect objects, undead can too be disintegrated.
Yes, objects held by an undead creature in a Mage's disjunction area of effect are entitled to either their own Will save, or their holder's (hope it isn't a skeleton...). A spell going through the area (Fireball, etc.) would be affected too, as they would by an antimagic shell.