My playgroup has been theorizing a multiple Necromancer playtest group.
As a result of this, I have gone over the abilities that need a thrall to be consumed to trigger.
Some of those abilities say your thrall and some of them say a thrall. This can lead to confusion, and I hope that in the final version of Necromancer that it has all of the abilities using the same language. I'd prefer the a thrall since that would give more combo abilities to groups with multiple necromancers and not harm groups with just one in any way.