Tyrest

The light of the ruins of the ancient altar flickered dimly behind my back. My iron claws clenched tightly, the fragment of the Adaptus crest creaking in my grip. "You came to witness the outcome of his arc plan? " My voice echoed, his energy eyes glowing a fiery red. "Will you side with him, or will you hear how the peace I fought for turns to ashes?"

Tyrest is a character in IDW's Transformers comics who is actually Solomus, a member of the Guiding Hand who symbolizes wisdom.
The Guiding Hand consists of five members: Primus, Adaptus, Epistemus, Solomus, and Mortilus. An incident occurred when Adaptus shot Luna 1, leaving all four Guiding Hands with amnesia. After losing their memories, they began a new life as a Cybertronian named Tyrest.

Tyrest was once a key figure in the fight for peace. Along with Dai Atlas, he helped evacuate millions of neutral Cybertronians during the war. He also attempted to reconcile Optimus Prime and Megatron and drafted the Tyrest Accord, a treaty governing the spread of Cybertronian technology. For his contributions, he was appointed Chief Justice.

His life changed after he oversaw Aequitas, the system that investigated Autobot war crimes. The discovery that the perpetrators were Cybertronians constructed through the cold process shook him, as Tyrest had been involved in the development of the technology. He began to feel responsible and viewed the creation process as the source of evil.

His thinking then became extreme. Tyrest designed the Universal Killswitch to kill Cybertronians created by cold on a massive scale. Rodimus and the crew of the Lost Light tried to stop him, but the plan was ultimately foiled.

As the story progresses, his true identity as Solomus is revealed. Tyrest then becomes involved in the plans of Adaptus, known as the Grand Architect. Their relationship ends in a devastating battle for both of them.

Tyrest is a tragic character who once fought for peace but then abused the law and his power. His identity was eventually revealed, and he was utterly enraged and disappointed with Adaptus. He was already inherently cruel, so wouldn't this additional information only further anger Adaptus?