Explosive Detonator is a static projectile spell that nullifies most mid-air spells (not just those cast by you).
If cast every-other-frame then it can effectively make you almost impossible to shoot, leaving only melee attacks and environmental damage as potentially lethal elements.
When projectiles are destroyed before their lifetime ends, any resulting explosion from them cannot carry information of who cast it. This means that no explosion is safe to the caster and also all of them are trick kills.
When multicast with explosive spells, they behave similar to Explosion series. (Verify?)
Prior to the wand and spell theme of Noita, the game had pipe bombs and a pipe bomb detonator card.[1]
Once the theme changed to wands and spells, Explosive Detonator was originally only applied to one spell, making it too situational and useless. It was then changed into a generalized explosive spell detonator instead.[1]
