Ultimatum

Ultimatum is a Transformer from the 2019 IDW portion of the Generation 1 continuity family

You can't see me!

_{This character has no official visual representation in any Transformers product or media... yet, at least.}

Ultimatum fought against the Threefold Spark.

Fiction

2019 IDW continuity

Ultimatum was among the several soldiers who fell during the final battle of the War of the Threefold Spark, thereafter being listed by the Memorial Crater. Cyclonus would commit all of the fallen to memory, later reciting Ultimatum's name to Sixshot. War World: Hunt