Martyr Host is a legendary major card out of the New mechanic pool. Spirit Host marches 4 wisps that fade after 6 s and burst for 600% damage in 2 u.

You can take it once · it only turns up when your Ultimate ability can actually use it · it can be offered for 0 of the 34 abilities.

Only one card can reshape that ability this way — this one, or Legion and Titan Host. Take one and the rest are gone for the run.