Searing Sanctuary is a legendary major card out of the New mechanic pool. Sanctuary burns for 300% radiance and drags enemies 1.5 u into it every pulse; it mends one ally for 3%.

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 Hallowed Ground and Eternal Sanctuary. Take one and the rest are gone for the run.