Help me break into this vault

[Ancient Yeek]

I'm a Black Guard Dwarf and there's a pyramid Vault.

I was trying to sneak into the Vault and unfortunately the Osylith that is way above my pay grade woke up and is now sitting at the entrance to the vault. I phased doored out and decided I'd look through the rest of the level hoping to find some Teleport other. There isn't any. I do have imunity to cold so I could try fighting it but I think it will probably just stomp me into oblivion so I thought I'd ask you guys if you had any dumb plans for how I can get in there. I have resistance to fire, acid but no resistance to electricity.

Obviously the correct decision is to leave the level but that's boring.

[Ancient Yeek]

More pictures attached

The Osylith is somewhere near the trapdoor in the 2nd image.

[Bill Peterson]

Do you have enough speed to try to get him to chase you away from the dungeon? Then you can teleport and try to sneak back in.

Still, unless you're playing with lose artifacts on, or are going for a low turncount win, best to leave.

[Ancient Yeek]

I've got 6 pots of speed could be worth a try also have 5 ESP mushrooms.

[Ancient Yeek]

Plan is now underway. I figure if I can get him far enough away I could dig in from the other side of the dungeon.

[Ancient Yeek]

So far all going to plan. Have to be quiet as I dig in from the other side! Also running low on mushrooms.

[Ancient Yeek]

So far so good. Dug all the way round. All that digging started to make me feel hungry so I drank a bunch of fine wine popped my final mushroom and washed it all down with some Speed.