Ring of Vitality

Ring of Poison Resistance, basically.

The Kraanan spell Resist Poison doesn't cut it, because it can be
removed by Purge. This ring cannot be dealt with so easily, and resists
75% of the vigor drain of poison application itself and 75% of the
actual poison damage dealt each tick. This is stronger in % than
the elemental resist rings because it is a very narrow effect and
because this ring will be competing with Rings of Invisibility and
Wedding Rings for the ring slot. It has to do what it does well.

This is an "adding something new" solution to the extremely overpowered
Dusk Rat / Illusionary Form poison. Bonus, it will also help against
spiders, poison fogs, and any other types of poison that may be added later.

I added it as a drop from Black Spiders, where it fits great among a laundry
list of sundry potions and rings. It has the same art as a Berserker Ring.