Legacy World
From Transformers Wiki

The Legacy World (レガシーワールド Regashī Wārudo), or the Legacy Spacetime (レガシー時空 Regashī Jiku), is an uncertain place. One of its qualities is the Amalgam Effect, which changes the bodies of visitors to this universe.
Fiction
Toy bios
Magnificus travelled to the Legacy World in search for Ga'mede. Magnficius bio The Soundblaster who appeared in this world was said to be the reincarnation of Soundwave, but this was unclear. Soundblaster bio He was pursued by Twincast. Twincast bio Crosscut, being a diplomat at heart, was not comfortable having to use weapons in the Legacy World. Senator Crosscut bio Metalhawk, on the other hand, fared just fine without the outer shell he had as a Pretender. Metalhawk bio
Also arriving in the "Transformers: Legacy World" were the mysterious Tarn Decepticon Tarn bio and the powerful Megatron. Megatron bio The Insecticons Shrapnel and Kickback's presence threatened the world's energy resources. Sharpnel bio
Notes
- Presumably, the Legacy World is the setting of the vague multiversal conflict that the Legacy franchise is meant to represent. It was not named till TakaraTomy bios for Legacy and Selects toys were published online.