I've seen slugs do 50-60 damage with breath before. It's uncommon, but they're very out of depth for that area, so their damage can be quite high. They can actually 1 shot kill Keethrax if you line them up. Going for the ants is not a bad idea first. Slugs are super slow, so if you have some missile capacity, you can pick them off at angles.
Rings are generally worth equipID in the early game, IMHO. The only bad one you can get is fish, and that isn't really a problem beyond the autocurse. Rings of damage are always of the ordinary/onyx/opal/adamantium set, so if you're concerned about a cursed ring of damage, just ignore those.
Hoping to win with every class, doomed. Archer, Barbarian, Bard, Beastfighter, Druid, Elementalist, Farmer, Fighter, Monk, and ULE Priest down.