Warriors of Thunder

The Spirits of Thunder were created by AncientBeetlemon, the Ancient Warrior of Thunder, as the legacy of his power. The Spirits of Thunder have the ability to combine with each other or with Spirits of other elements, becoming even more powerful.

AncientBeetmon
AncientBeetlemon is an Ancient Insectoid Digimon and one of the ten Ancient Warriors with the power over thunder. His body combines elements of the Kabuterimon and Kuwagamon digivolution lines. He can move nimbly on his six legs and has a large thunder-gun. This super-shelled fighter can attack from the air. His names come from the English words ancient and beetle. He left behind the Spirits of Thunder.

Digimon Battle Spirit 2
In the game, AncientBeetlemon appears as a "finishing" move for Beetlemon. If Beetlemon fills up his power meter, he can warp digivolve into AncientBeetlemon and fire a huge lightning bolt at his opponent.

Attacks 
 * Terra Blaster: Fires a beam of destructive energy.
 * Calamity Thunder: Creates a thunder storm that fires randomly in a small area.

Beetlemon
Beetlemon is a Champion-class Hybrid Digimon. He is the Legendary Human Warrior of Thunder, using the power of AncientBeetlemon. His Japanese name is Blitzmon, which means lightning in German.

Digimon Frontier
Attacks
 * Lightning Blitz (Lightning Topper): Beetlemon's horn emits a powerful electric charge.
 * Thunder Fist (Thor Hammer): A powerful electrified punch is launched at the enemy.
 * Proton Slam (Mjöllnir Thunder): Beetlemon tackles the enemy while his body is charged with electricity.

MetalKabuterimon
MetalKabuterimon is an Ultimate-class Hybrid Digimon. He is the Legendary Beast Warrior of Thunder, using the power of AncientBeetlemon. His Japanese name Bolgmon comes from "bolg", the Irish word for thunder.

Digimon Frontier
Attacks
 * Volo Thunder (Ultimate Thunder): Releases from both his arms energy that resembles a two-weight bola.
 * Electron Cannon (Field Destroyer): A powerful electric blast that can be fired from the distance. This attack requires a brief charging period.

RhinoKabuterimon
RhinoKabuterimon is a Mega-class Hybrid Digimon, holding the power of AncientBeetlemon. As the Legendary Advanced Warrior of Thunder, known as the Fusion Form (融合形態) in Japanese media, RhinoKabuterimon is a combination of both Beetlemon and MetalKabuterimon. His name comes from rhinoceros beetle and Kabuterimon (or kabutomushi).

RhinoKabuterimon is a Thunder King who can create special magnetic fields by his horn.

Attacks
 * Thunder Laser: His horn shoots out lightning and makes a large thunderclap.
 * Condenser Storm: He jerks his body up and calls a great storm from the sky.