Seizer is the fifth and ninth boss that Toad faces in Game B of Round Mode in the Nintendo Entertainment System version of Wario's Woods. Seizer is a skeleton wearing a hooded robe and carrying a strange book. His overall appearance gives him the appearance of a Grim Reaper like creature.
Seizer makes his first game appearance in the NES version of Wario's Woods where he was a boss character that Toad has to face off against. Seizer makes his appearance in the forty-ninth round and has 14 hit points. He has the power to make two complete rows of enemies fall at a time. He also sports the generic abilities of throwing enemies and re-locating himself to different areas of the stage. If Seizer is to re-materialize on Toad after re-locating himself, he instantly defeats Toad.
In the eleventh, twelfth, and thirteenth issues of the Japanese exclusive manga series Super Mario-Kun, Seizer makes an appearance as a boss character that Mario, Luigi, Toad, Yoshi, and Wanda had to face within the Wario's Woods adaptation in these issues. However, being one of the harder opponents that the group had faced, Seizer easily defeats Mario, Luigi, Yoshi, and Wanda using his powers and nearly claims victory.
Toad, who originally fled the battle due to being frightened by Seizer's threatening appearance, manages to gather his strength after seeing his fallen friends and challenges him alone. After a long battle, Toad defeats Seizer.
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