Skull castle

I have searched the posts, but didn't see anything...when you give the scroll to Adrianna, do you choose the key or the ring? How come neither can be stolen from her? If you get the key, where does it go? If you get the ring, what do you use it for? Can you get the ring, and then whack her and her friends for XP?
Is the longtootn hide for Talrik somewhere else on the island?
What's next after skull castle?

[Wyvern]

YOu can choose whichever you want - you're going to end up fighting it out with her and her friends anyways. The key opens a vault down in the area where you found the scroll. She doesn't offer you a ring - she offers you a "gift" which is to become a vampire. Vampirism cannot be cured.

Wyv

Adrianna offered me Vampire Breath, which isn't Vampirism, right?
THen I had a choice between a gezzered ra ring, and a key...do I need the ring ever? Do I need to get into the vault?

[Davros]

The ring is the vampire ring - 3 x 100% resistances plus regenerate. If you haven't installed the patch then don't equip it as it crashes the game. Select it, and sell it if you have no vampire or patch (get a few thou gold). The key is not needed - the level 12 lock can be picked by trying and jamming, then using level 7 lockpick skill and a level 5 lockpick

[carg]

Wyv, you've missed one here: she offers ring or key AND becoming a vampire.
Choosing to become a vampire gives you two traits: vampirism and vampire breath (is like frost breath). Together with the vampire ring vampirism is possible, but it is still a nuisance.
Longtooths are random encounters (on land), so just exploring will sooner or later yield one. You're not in a hurry to solve that quest anyway, because the reward can only be used after doing the temple of Isis, which is the dungeon to do after skull castle.
I found the level 12 lock easiest to bash open with a strength specialist (strength 24 has worked every time for me).