As I multiple times accidentally bound two shards at the same time (having both in hotbar) it would be nice to be able to transfer the soul of one to the other. That would also allow it to efficiently farm single types of mobs in multiplayer (everyone killing what he finds)

You can already combine shards of the same mob in an anvil.

That means I'm always "wasting" a shard when splitting up work?

@TehNut I tried it (being on 1.0.11 for fabric) and it doesn't work:

I checked twice. Both shards are for skeletons. Neither same nor different owner worked.

I seem to have never implemented shard combination on the Fabric version