The Forge of Solus Prime is the symbol of office of the master-artificer of the Thirteen. It resembles a huge hammer wielded by its creator, Solus Prime. It was used to craft all other ancient artifacts of the Thirteen and could even craft the core components of a Cybertronian body from scratch. It can only craft objects from material if it is in the hands of a Prime; otherwise, it's just a large hammer. It has a considerable weight that only few Cybertronians have the strength to lift without any difficulty.
The Forge was either created by, or given to, Solus Prime who named the artifact after herself. With it she forged the weapons used by the Thirteen such as the Star Saber and Requiem Blaster. She used it as her personal weapon against Unicron. After the Chaos Bringer was defeated, the different personalities of the Thirteen emerged. Megatronus was shunned by his brothers and sister and he believed they thought he was too much like Unicron. In rage, Megatronus murdered Solus and was exiled by his brothers after being dubbed "The Fallen". Solus was buried in a distant galaxy away from the site of her murder. Her Forge, like many other artifacts, was given to Alpha Trion who hid until the time was right for it to be used.
After losing his memory, "Orion Pax" decoded three Iacon coordinates for Megatron. The last of which was the Forge. Knock Out and Breakdown were sent to retrieve it (though they had no idea what it was). Optimus, Arcee and Bulkhead came to get it and Bulkhead was amazed at what the Forge could do. While Knock Out kept the other two at bay using his force field, Bulkhead and Breakdown fought for the relic which ended with Bulkhead knocking Breakdown onto Knock Out with the hammer. Megatron then emerged from a Ground Bridge and shot Bulkhead claiming the Forge.
Forging in the wrong hand
When Optimus acquired the Star Saber, Megatron was desperate to match his power. So desperate, he stole the arm of a deceased Prime and had it grafted it to himself so he could use the Forge. Using it and a large piece of Dark Energon he created the Dark Star Saber, the Slayer of Primes.
With a True Prime
When the base was destroyed, the Forge was not damaged. Smokescreen had smuggled out the heavily damaged Optimus Prime. Optimus mentioned the Forge and Smokescreen thought if Optimus had the Forge he could heal himself using the Power of the Primes. Smokescreen infiltrated the Nemesis and retrieved it from the ship's vault. As time was of the essence, he did not take the Star Saber. When he brought it to Optimus, the Prime revealed the Forge was running out of power and any left should be used to recreate the Omega Lock, by the hand of a new Prime. Smokescreen said that there was no time to begin a search for a New Prime before Optimus said that Smokescreen had been chosen by the Matrix as his successor. Smokescreen believed he was too young and begged Optimus to use the Forge. When Optimus died, Smokesceen was presented with the Matrix of Leadership. Rather than take it, he put the Forge in Optimus' hand which restored him, but drained the Forge. Smokescreen took the Forge with him when the Autobots regrouped and was assured by Ratchet that he'd done the right thing.
War Hammer/ Destroyed in battle
When Ultra Magnus was deployed to Scotland, with Optimus' permission, he used the Forge as a weapon and used it against several Vehicons, and also scored some good hits on Predaking. When he and Wheeljack later fought Predaking, now in robot mode, the Predacon once grabbed the hammer and used it to hit Magnus, before attempting to kill him with it. Magnus and Wheeljack then launched a counter-attack. They failed, and Predaking snapped the hammer at the hilt before attempting to kill them. Luckily, Optimus Prime flew in and saved them just in time, but the Forge's fragments were not seen to be recovered.
Some years later, Ultra Magnus appears to have either had the Forge repaired or replaced it with a virtually identical one. Even a new hand to replace the crude prothesis. He would continue to employ this hammer as his melee weapon, such as when he joined forces with the Bee Team to battle members of the Cybercomrade Sect.
- Solus Prime (Original Owner)
- Alpha Trion (Presumably)
- Breakdown (tried picking it up)
- Dreadwing (gave it to the Autobots)
- Optimus Prime (used it to remake the groundbridge)
- Smokescreen (carried it to the damaged Optimus)
- Ultra Magnus [used it as a weapon (for a short period of time)]
- Predaking (destroyed it)
- Fortress Maximus Nucleon Shock Cannon (failed), attempted to be created by Megatron when he retrieved the hammer. Unable to use it without the power of a Prime.
- The Dark Star Saber, created by Megatron using the arm of a Dead Prime.
- A Space Bridge, created from a GroundBridge by Optimus Prime after receiving the hammer from Dreadwing.
- The Star Saber, recreated by Optimus after it was destroyed by its dark counterpart.
- Optimus 2.0 (Optimus Prime's second body), forged by Smokescreen by placing it in Optimus' hand, done to save his life and turn the tide in the war.
Drained of power uses
- Ultra Magnus used the Forge to bash and destroy countless vehicons.
- Ultra Magnus also used the Forge to attack Predaking. Sadly, it didn't last long as Predaking was able to break the Forge in half.
- Breakdown couldn't hold the Forge, Bulkhead was able to hold the Forge with both hands, while Megatron held the Forge with only one hand. When Dreadwing gave the team the Forge, Optimus was able to hold it with one hand. Smokescreen was able to drag the Forge to Optimus. Ultra Magnus was able to use the Forge with both hands. Predaking was able to pick up the Forge so easily and broke into pieces, rendering it useless of any use.
- Suns are capable of forging any raw element (up to iron; anything heavier requires a supernova) under the right conditions, so it's fitting that the star-powered Forge of Solus Prime can forge anything from raw elements under the right conditions.
- The Forge may be the only weapon that was capable of restoring any damaged Cybertronian and weapon.
- The Forge has no effect by electricity as when Wheeljack use his electro whip.
- It's unknown why the Autobots didn't use the Forge to recreate Bumblebee's voicebox while it was in their possession when it was mentioned in "Operation: Bumblebee, Part 2" that they could accomplish such a task.