Catalyst obelisks

Stand in the glowing ring until it finishes charging. The tower activates every other monolith and obelisk that is on screen at that moment, including towers only partly in frame, as if the pet had stood in each of their rings. Red arcs while charging show exactly which towers will fire. Already-used towers and other Catalyst obelisks are skipped. An empty frame still consumes the tower.

If the pet is still in the charge ring when a Catalyst is mined out, the sweep still fires. Towers the sweep already promised keep their activations even if the Catalyst is mined during the cascade. Cart monoliths opened by the sweep present their pick one at a time.