I'm about a week off from the third session of a game I'm running, and I've got them on a relic hunt. Plot-wise, it's the broken up pieces of the Cosmic Principle, taking the form of shards of what appear to be pieces of open space, complete with stars and galaxies swirling through them, and when put together, it's going to have infinity stonesque influence over the cycles of entropy and genesis. Its origins were a mystery even before its existence was lost to the Gap, but it was studied by the Kasatha (or perhaps the Contemplatives of Ashok?) and inspired the first Solarian. The party is going to be chasing the different pieces of it (haven't decided how many there are yet) and racing other factions who want it, but they're going to find their first piece (and really kick off the plot, because they're sort of stumbling across it whilst doing another job) so I need to figure out exaclty what sort of powers these things are gonna have, and was wondering if these boards had any ideas?
Party is currently level 2, and there IS a solarian in the party, so I was thinking, with a single piece, it sends them into cycling, uncontrollable zeniths? A solarion would immediately attune upon putting it into their mote, and on the following round, they become fully attuned (1 round early) but then immediately use their action for the round to activate a zenith revelation (supernova or black hole, in most cases), then they become unattuned. On the following round, they automatically attune to the other aspect and the process begins to repeat. Each time their zenith is unleashed, they must make a DC20 fort save or become fatigued (or exhausted). If they fail this save when already exhausted, they fall unconscious for 10 minutes and the artifact stops functioning. They also cannot easily turn it off voluntarily once they've placed it in their mote, and it requires a DC20 will save to do so.
Is this ability too powerful? Do you think there are other ways it could be made to be useful for other classes? What might it do when more pieces are eventually collected? Appreciate any feedback/ideas.
Maybe instead of forcing him to use a Zenith Revelation, have it keep him at Full Attunement until he uses a Zenith (allowing him to reap the benefits of full attunement) and then have it cycle him to the polar opposite.
Maybe later versions (when he has gathered more shards) could even allow him to enter a mode that counts as full attunement for both modes simultaneously?