Raiendan

is a technique of Shūsuke Amagai's Bankai, Raika Gōen Kaku.

Description
Pointing his sword forward, the blade of Amagai's bankai begins to glow red hot. A ball of fire gathers at the tip of the blade as it grows. The fireball then splits apart into multiple, smaller ones as they all launch forward at a target. Though initially spread out in a line, the fire balls converge on the target as they approach it, with the outer balls of fire noticeably curving inwards toward their target. The extent of the damage capable with this technique is not known as Ichigo Kurosaki managed to easily dodge the fire balls before they hit him, causing the attack to rupture the ground.