Commands

All under /fundamentum, for operators (level 2), except /fundamentum_sky, which is a client command anyone can use.

Command	What it does
/fundamentum moon start <id>	starts any loaded moon or night event (tab-completes them all), making it night first
/fundamentum moon stop	ends tonight's moon and night event
/fundamentum moon list	every moon and night event, marked [up] or [off]
/fundamentum moon query	names tonight's moon
/fundamentum moon raise <id> / clear	raise or clear a moon without changing the time
/fundamentum event raise <id> [ticks] / clear / query	the same for night events
/fundamentum element help	the elements manual in chat
/fundamentum element reactions	every loaded reaction, in order
/fundamentum element auras <targets>	the auras on creatures
/fundamentum element clear <targets>	removes them
/fundamentum element affinity <targets> <damage type>	how much they resist that damage type
/fundamentum element hit <targets> <damage type> <amount> [attacker]	a test hit (resets the hurt cooldown, so several in a row all land); prints the health taken and the auras left
/fundamentum tps [dimension]	TPS and ms per tick, per dimension with entity and chunk counts; one dimension lists its ten most common entity types
/fundamentum showcase <mod>	builds a gallery in the sky: a lit glass case per mob from that mod (or minecraft)
/fundamentum showcase return / clear	takes you back / removes the gallery
/fundamentum_sky preview <id> / off	shows a fractal sky now, on your client only

Elements, tps, night events and the fractal sky command are NeoForge 26.1.2 and 1.21.1 (tps and night events are also on 26.2).