If you still have this thing (and I am amazed you found one with 5 charges), and as you're a beastfighter, you might consider eternium type equipment that beastfighters can use, like gloves or bracers (as I assume you're fighting unarmed and unarmored?)
Anyway, "sometimes" a helm of water breathing is a boon if you want to go for an ultra ending and don't have rings of the fish (which always seem to be cursed when found - verify?)
Rings of Ice are wonderful to have for the ToEF. Sometimes wishing for potions of gain attribute is a second good choice, as you may receive up to three (always if possible, wish on your birthday while blessed)
Also once I wished for Eternium Tower Shields and got three. I kept them for when I was needing to set tactics to "coward" and I equipped both, so I could book it (also wearing seven league boots :P ).