Long Bastion is a legendary major card out of the New mechanic pool. Bastion Field stands for 26 s in a 3.5 u dome, on a 20% longer cooldown.

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 Thorn Bastion and Wide Bastion. Take one and the rest are gone for the run.