Vast Zenith is a rare major card out of the Synergy pool. +25% damage on your Ultimate over a 12% wider area.

You can take it once · it only turns up when your Ultimate ability can actually use it · it can be offered for 6 of the 34 abilities.

Only one card can reshape that ability this way — this one, or Far Zenith, Lingering Zenith, Forceful Zenith and Keen Zenith. Take one and the rest are gone for the run.