Cannon Orb is a legendary major card out of the New mechanic pool. Arcane Orb becomes a fast, narrow shot that stops at the first body and bursts for 300%.

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 Orbit and Twin Orbs. Take one and the rest are gone for the run.