Tricky. The spell says it targets the second last enemy, so when there’s only one enemy left it should obviously fail. Can’t hit what isn’t there. However, there’s been a similar bug report about this at the beginning of the year, in which @OminousGMan claimed this was identified as bug that would be corrected.
Given the lack of any further communication and seeing that the spell still behaves the same, I guess it’s pretty safe to assume nothing will be changed, no matter if this is a bug or not.
I wouldn’t be so pessimistic. It took YEARS for them to fix the banner colors for The Labyrinth (which, okay, is kind of pessimistic in and of itself), but in the end they did fix it.
Thank you for letting us know about this. I’ve tested Queen Ash on our side and discussed how the spell Graven Seal is meant to bework when cast and this is a bug.
Even with one enemy troop on the board, the spell should be targeting it. I’ve reported this to the dev team to get this corrected.
I believe there was a statement that the Maze Banner may have not been intentional but there were no plans to change it…until they did, with no warning or word on the topic at the time.
EDIT: searching through old posts. Confirmed on live stream. Maze Banner was not a bug.