COALESCE

Five transmuters line the floor. The cloud drifts free — it never falls in on its own. Drag a particle down into a transmuter and it keeps changing while it is inside; drag it back out into the open field to stop:

IGNITE — heats & brightens
SPLIT — halves it in two
FUSE — swells it large
CHILL — cools & calms
CHARGE — attracts & repels the rest