I'm in need of some technical advice about breaking into a magic vault.
The background is this, which might be a little tl;dr, so the next three paragraphs can be skipped in a pinch:
I'm playing in a Planescape campaign at the moment, and the party has been named heirs to a castle that, as it turns out, can jump between planes by using a magic orrery. The castle contains also a huge vault, which, according to the late baron's will, will unleash all manner of unpleasantness if opened.
We have managed to open the vault once, however, by accidentally shunting the castle into the anti-magic zone at the base of Sigil's spire. While working on a way to get home, we took the opportunity to open the vault in hopes of avoiding whatever mystical hell it would release, were its magic to function normally. We've looted some sundries and some gold, then closed the vault before getting the castle out of there with a macguffin, but here's where it gets interesting.
I'm playing a goblin with no name, a gun in one hand, spells in the other, a black hat on his head and insatiable greed in his heart. While looting the vault, he went straight for the pile of gold, which was encircled by a string of magic runes (rendered inert by the dead magic in the area). He managed to identify them as the edge of a portable hole, but kept that fact to himself, thinking that the pile must then be just the top of an even bigger pile in a suppressed extradimensional space underneath.
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Here's where I could use some advice. I kept hold of the vault key, and I want to sneak back inside to snag that portable hole and all its riches, but I'm sure all the magic horribleness alluded to in the will has now reactivated. At present, I have no concrete idea what the consequences might be - could be anything from fireballs and lightning to opening a portal to a Blood War battlefield. I hope to find out with copious use of Detect Magic, Spellcraft and Knowledge (Arcana), but I'm playing a Spellslinger 1/Magus 4 and thus don't have trapfinding. I otherwise have a high Disable Device skill and will be summoning a familiar shortly.
I'm thinking I could get an Unseen Servant to open the vault for me while I take cover behind a shelf. I could wait for 3 levels until I get Dispel Magic, but that'd be too long for such a greedy soul. Depending on what further examination yields, I might have to ask the party's Detective for help, but that would no doubt involve sharing the money. What other options can I make use of?
PS: In the spirit of sportsmanship, I'm sure the character will slip up somehow and reveal the fact that he found all the extra money to the party. Not trying to cheat the other players' out of their wealth here, even if my character definitely would. :V
Scrolls of dispel magic and summon monster/nature's ally??? Thoqqua can make short work of doors and walls with their melty burrowing skills.