You may remember that a large assortment of monsters is planning to be in RoD, each with unique approach to their liquidation. Bosses and mini-bosses are no exception.
One of the features of the boss mechanic is their summoning, which is done through a certain ritual.
The video shows the simplest version of such a ritual on the example of the low-level mini-boss.
Of course, many aspects of this work are still in the process, but already at this stage player understands the need to explore dungeons through the mechanics and can collect and balance his equipment along the way before calling the mini-boss.