Growth
Facets of the Path
A facet is a choice instead of a choice: the Warden takes the hit, the Berserker pays health for damage, the Weaver lives on the energy of the Source.
Growth
It changes stats, the hero’s behaviour in a fight and the ultimate. Facet tiers open at levels 25, 40 and 55.
Changing a facet costs gold and doubles in price each time: you may waver, but it is a cost, not a switch.
Everything here is taken from the game’s own reference — the same one a Keeper opens in town. Русская версия статьи.