Twin Fault is a legendary major card out of the New mechanic pool. Groundbreaker sends two waves 30° apart at 60% damage each.

You can take it once · it only turns up when your Special 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 Fault Line and Standing Quake. Take one and the rest are gone for the run.