Here is Wargarudamon in his Phoenix Burst mode.

In this mode he is stronger and has celestial flames around his body. It is subtle except around the head, lower arms and lower leg and feet areas.

While in this mode the he has the same moves except with the ability of not harming life. As such Wargarudamon can stop any foe and not destroy it completely unless such a being is completely void of life and / or is void of any love and feelings. He is the ultimate threat to evil in this mode.

Darkwargarudamon has a similar mode. Only this mode is called Dark Phoenix Burst Mode where, instead of emitting celestial fire, he emits hell fire. While in Dark Phoenix Burst Mode, Darkwargarudamon can destroy anything he touches, has perfect indifference to anything that exists and is the ultimate threat to good while in that mode.

When Wargarudamon and Darkwargarudamon meet while in their respected modes it is said that the very fabric of reality and existence are in the balance. ^\/^.