In my Warden playthrough I got a Grim Bow a Grim Runic Sword and pretty early on a Ring of Arcana +0. The Imp gave me a Ring of Furor +2.
What do you think I should upgrade and wear? Arcana for a higher chance of Grim activation or Furor for a higher chance through more shots, especially since it's already +2.
I'd rather not wear them both because I like my Chains and Chalice too much.
Edit: I ended up with Furor +6 because I just like the fantasy of her firing off arrows like a machine gun. Should've enhanced it for speed, but that often means for the bow that it regularly does 0 damage in later levels. But I guess Grim would have offset that.
Hard to directly compare the rings like that, especially since they're of different levels.
A Furor+2 gives you approx. 4 hits in 3 turns, so about +33% damage based on turns.
Grim trigger more by weapon level and the lower the mob is in health.
Assume a mob at 75% hp, hit 4 times (in 3 turns) with a +3 weapon, that's about 50% chance of triggering Grim.
Arcana+0 would have about 50% chance in 2 hits under same conditions.