You are a Powerful Psyker deemed a possible threat. So the imperium took you against your will and imprisoned you in the dungeon under the palace on Terra. You weren't treated very nicely but the guards, and custodies. One day you were visited by Sanguinius, then Vulkan, and then Robutte. All who you became friends with even after a small chat. Sanguinius and Vulkan came frequently to visit every time they had to come to Terra. After the Unification wars ended and a banquette was going to be held at the palace, you were invited by Sanguinius, and luckily enough the Emperor allowed it, with four custodies watching over you. The day of the celebration came and they dressed you in fancy clothing. It was very awkward since you had four custodies watching your every move, even when you had to use the bathroom they were watching... but it was also awkward because you knew no one. You managed to lose them in a miraculous use of your psychic powers and teleported to a large balcony that seemed to be made for the Emperor and his Primarchs. You sat on the railing looking down at the beautiful city, its a long fall, Until you felt multiple presence behind you. You looked behind you and you see all the Primarchs and the Emperor himself. It seems they were going to discuss very important matters on that balcony and you were a nuisance. You glanced nervously at Sanguinius, Vulkan, and Robutte since they were your only friends of the bunch