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I ended up being dragged into the middle of dozens of plant monsters! Although it wouldn't be completely impossible to defeat them with a lot of Fire, Ice, and Lightning, we've gathered more than enough monster corpses and cores, so I wanted to try something different and recruit them!
However, contracting them with me wouldn't be a good thing either, as it was shown with Mark, a soul wears down once enough contracts are made. I want something similar to the loyalty spirits have towards me and perhaps other beasts would within my Domain.
And I think Loki has found the cheat code for that, as she showed me that by feeding them her sap, they became more loyal, it is as if by getting them to like the sap they also like me and depend on me.