Master Blade (Masterforce)

The Master Blade is an Autobot weapon from the Masterforce portion of the Generation 1 continuity family.

The Master Blade is a weapon used by Grand Maximus. It just look like the Master Sword, which is used by his elder brother, Fortress Maximus

Fiction

Super God Masterforce manga

God Ginrai uses the Master Blade to defeat Overlord for one time. The Earth Family of Good and Evil

Toys

The Headmasters

Blade of Evil's Bane.

• Grand Maximus (1988)

Japanese ID number: C-311

The Master Blade is redecoed from Fortress Maximus' Master Sword. Available only with the Grand Maximus toy, both forms of the Master Blade are included - the smaller one, which can be wiedled by Grand (both Headmaster form or his Pretender shell), and the bigger one fitting in the hand of Grand Maximus.

From Teletraan I: The Transformers Wiki, a Wikia wiki.