Twin Lights is a legendary major card out of the New mechanic pool. Guiding Light fires two bolts at 70% damage and mends 2 allies at 75% of the heal.

You can take it once · it only turns up when your Main 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 Lance of Dawn and Beacon. Take one and the rest are gone for the run.