Dark Claw Mode

Dark Claw Mode is a Combination between Megatron and Nemesis Breaker.

Cybertron anime
After he returned from the death, Megatron used the power of his Unicronarmor to restore the wounded Crumblezone, gain a new body for himself. When the Autobots realized his return, Leobreaker attacked Megatron on his own. Megatron then used the rest of the mist around him, to create a new warrior for himself: Nemesis Breaker. Nemesis Breaker battled Leobreaker and soundly defeated him. Megatron, who was proud of his newest Creation, ordered him to combine with him into Dark Claw Mode. The two of them beat Leobreaker to the ground, until Optimus Prime arrived. The two Autobots then combined into Savage Claw Mode, but were evenly matched. They retreated and Optimus returned with Wing Saber. After two short battles, the power of Sonic Wing Mode proved to be too much for Megatron and he retreated.