Heavy Strike is a rare major card out of the Synergy pool. Your Main deals 60% more damage and shoves harder, but each cast takes 0.15 s longer.

You can take it once · it only turns up when your Main ability can actually use it · it can be offered for 11 of the 34 abilities.

Only one card can reshape that ability this way — this one, or Seeping Strikes, Lance Strikes, Sweeping Strikes, Driving Strikes and Sundering Strikes. Take one and the rest are gone for the run.