ToME: the Tales of Maj'Eyal

Or maybe increased lung capacity instead. It's an artifact that many players will encounter, and water breathing is a handy intrinsic without being overpowered.

Well it was made by nagas, which shouldnt really need water breathing

But I like the increased lung capacity

Which could also mean a bonus to max stamina. But iirc dg is on a inrpoving non-random artifact drive.