Grounded Arc is a legendary major card out of the New mechanic pool. Overload leaves a lightning field for 4 s that pulses 25% of its base damage every 0.5 s; the burst is 80%.

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 Chain Overload and Focused Overload. Take one and the rest are gone for the run.