From Henshin Justice:
The Infinity Ring is created from Haruto’s wish to protect everyone as
he sheds a tear. He’s equipped with a shining armor, along with his
weapon Axcalibur. WizarDragon transforms into the Axcalibur, brimming
with magical power. Only Infinity Style is able to use the Axcalibur,
because of the amount of magical power it contains. It has two different
modes, Axe mode and Calibur mode.
When it’s in Axe mode, the Axcalibur can change in size in order to activate the special attack, Dragon Shining.