You can attune pets to the Lyre of Orpheus (possibly only if you are a bard and it’s your own quest artifact). Attuned pets that die near the harp leave no corpse (so they can’t be resurrected twice via undead turning), but can be resurrected later by invoking it. This replaces its current invoke power.

For a more balanced implementation (so you can’t let multiple pets die over thousands of turns and then invoke it to get an instant army), it will only resurrect one pet, possibly allowing the player to pick which.

For a simpler implementation, only the last attuned pet to have died near the Lyre gets resurrected.

Bards as a monster, who spawn in a group of same-race monsters with a (sometimes but not usually) magical instrument, and they keep their distance and play songs to buff their allies.