Explosive Magic Crystal

Explosive Magic Crystals or Burst Spheres is a elven magic tool.

Description
Explosive Magic Crystals used magic stones as a detonating agent and that they are rather expensive. It can be activated by chanting『─Explode. Slay thine enemies─』to explode.

Appearance
It looks like a black sphere seemed to be a combination of 2 half-spheres that were tied together with a string. It was a bit like a ball in an oven pan.

Abilities
According to Ariane, Burst Spheres are basically rune stones and explosive powder. They function similar to magical hand grenades.

One explosive magic crystal has enough power to easily blow the castle gate off of its hinges if the timing is right.

Trivia

 * From Arc's perspective, Explosive Magic Crystals are a kind of magical hand grenade.
 * They are equally valuable as rune stones and they usually cost 10 gold coins each.