Square of Self-Destruction (自律崩壊魔法陣 Jiritsu Hōkai Mahōjin) is a Caster Magic created by Brain.
By activating this Magic, the caster places a complex self-destruct sequence on any person or object. Jellal Fernandes stated that without the cancellation code, this Magic cannot be stopped. On the contrary, however, it was shown that the Magic's creator, Brain, could easily dispel it without any need for the code.
- Fairy Tail Manga: Chapter 146, Pages 18-20
- Fairy Tail Manga: Chapter 147, Pages 7-8