Reposting this here after a recommendation on the sentinel forums:
The resonating cleave node triggers an abyssal echoes cast after using void cleave, which costs mana. I’m noticing that when my void cleave echoes, the echoed void cleave is also casting abyssal echoes - which is also costing mana. This is creating immense mana pressure and I don’t think this is the intended interaction as echoes are designed to be entirely costless.