Слабый кристалл активации

Your rituals require more than simply the correct arrangement of blocks and Sigils. An effort of will is required to open a channel from your Soul Network to the ritual, and The Activation Crystal will allow you to focus yourself enough to activate your rituals.

Simply press [ПКМ] with a bound Activation Crystal on a Master Ritual Stone to activate the ritual it's part of - assuming it's suitably assembled, that is.