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It's great that you're all suggesting ideas like this. It's exactly what we wanted to see with the release.
We've already discussed the idea of 'Mass Conjure' in the past!
Please make it so the player can choose which ones to put together to "summon". Not everybody would want all conjures at the same time since the zombie is giving less xp due to poison.
The thoughts we had in the past were exactly this.
You could choose a set number of spirits to bind to the ability. It's a great comment, because you're thinking ahead to the future! We will have more spirit types, etc