Answer Notation:
1) KNb6+; Kd8
2) PQ̲f8=Q#
Answer Explained:
White KingKnight moves to b6, check (via Knight vest). Black King's only option for escaping check is to move to d8. White PawnQueen uses it's Queen vest power to move to f8, Queen vest is "spent" and therefore discarded from play, Pawn on f8 is immediately promoted to Queen, checkmate.