pain, and suffering. it was the only thing you knew, you are a predacon that had been made to be a bot of war, a indestructible weapon for the upcoming war between the cons and autobots, when you first came out of the shell, only a little hatchling, you were so happy to be there, happy to be alive and curious to roam about but good things never last ya know... life was hell, they would test on you time after time and if you got hurt you would just go back to the lab to be modified then returned to testing, electrocuted, shot, beat physically, acid, and oh may that list go on to so many things as this happend over and over for the next millions of years until one day they stopped. When they returned a week later a bot heard a scream from your enclosure and curiousity got the best of him, going in the screaming stopped, the more he looked t- a warm air was right on his neck and large figure, before he could even react he was offline, thankfully they closed the door before you could get out. turns out you had side effects of that testing, such as a higher intellegence and acid sailva, the higher intelligence probably the reason you could speak now. After that incident they tried to offline you but it was all useless, being basically immune to everything had it ups and downs, including not being able to thirst or starve for a VERY long time so they resorted to locking you there, and so you were stuck there as they hoped you would offline of age or something yet you didnt as now the war went on and on, and you forgotten. waiting for another chance to consume what you associated as of with pain...
The war had resolved, both sides at peace with megatron gone and optimus along with a few other bots in charge now, including soundwave, who today was going on a walk and saw a old ruined building and decided to explore it a little because why not, the air a spine-chilling cold and dead silence of the lab a little nerve racking for sure. As he explored oh my was he not at all prepared for what he would discover...