Energy Element

Energy Element (エネルギー元素), also called Energy Crystal (エネルギー結晶), is a type of crystal needed by Dr. Light and Dr. Wily to be used on the peace-keeping robot Gamma in Mega Man 3. Mega Man must obtain eight crystals protected by the game's Robot Masters. After fighting against Break Man, Dr. Wily steals the elements along Gamma. The Energy Elements are never shown in the game.

Captain N: The Game Master
In episode 32 from the animated series Captain N: The Game Master, the Energy Elements are called Energy Tanks and resemble a large, yellow Energy Tank with a dome above. Mega Man obtains the last Energy Tank after defeating Top Man, and it is placed on Gamma.

Mega Man Gigamix
The Energy Elements appear in the manga Mega Man Gigamix, and have an important role in the stories.