One of the creatures in Kobold Press' Tome of Beasts for D&D 5e is Koschei, a Slavic Lich whose soul is hidden within nested objects. Here is the relevant part of the trait in question:
Hidden Soul. A creature holding the egg containing Koschei’s soul can use an action to compel Koschei as if a dominate monster spell were cast on him and Koschei failed his saving throw. [...]
The spell Dominate Monster, which requires concentration, states, in part:
You can use your action to take total and precise control of the target. Until the end of your next turn, the creature takes only the actions you choose, and doesn’t do anything that you don’t allow it to do. [...]
Each time the target takes damage, it makes a new Wisdom saving throw against the spell. If the saving throw succeeds, the spell ends.
With no concentration or saving throws required, does this mean a player character holding the egg has complete, unlimited control over this CR 17 creature? It seems like there is nothing to stop players from keeping Koschei as a luxury minion, or ordering him to commit suicide.
Am I missing something? How is this trait intended to work?
