Quickblade is a legendary major card out of the New mechanic pool. Crescent Chain swings 35% faster at 75% damage with +8% crit chance.

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 Tempest and Crescent Wake. Take one and the rest are gone for the run.