[quote=@CaptainManbeard] I had a similar idea for my Sith character XD. I was thinking of making them eventually become an evil character, and she is an alternate timeline version of my good character's twin sister. They come from very similar timelines that split off at the moment of a plane crash when they were kids. In the brother's timeline, his sister died, and in the sister's timeline, her brother died. He managed to grieve and then recover, but she still harbors a lot of emotional trauma from that day and gradually becomes resentful of her alternate timeline brother for him not having been as miserable as her after losing his twin. Not only that, in his timeline, their parents had another daughter, while in her timeline, their parents divorced and then eventually died in a car crash while they were arguing. She begins to feel betrayed that the other version of her family had such a happy life without her and that sparks the gradual corruption of her Quantum Shard. As for your idea for time powers, I'd be curious to see just how far you wanted to take them. Since the Cosmic Crystal is a fourth dimensional construct, and by extension the Quantum Shards, I'd imagine any temporal-shifting abilities would not directly effect anyone who also had a Shard. But it could effect the environment around them. As for the future version of your character, I'd imagine their Shard would be a different one than the past version, since it seems unlikely that a fourth dimensional object could go back in time and co-exist with a past version of itself. Instead, it could be that his timeline was ripped in two as well, with a different Shard going to each half and finding him in both timelines. I have to head to work now, but we can discuss it more later. I'm excited! [/quote] I don't see any causal conflicts since alternate timeline versions are not the same as direct future versions of the prime individual. The way I see it, this future version comes from a parallel reality/alternate timeline, but in its future, and goes back in time/hops from timeline to timeline in order to stop or counteract their 'prime' self and alternate selves. As opposed to coming directly back from the 'prime timeline's' future, which even if we did allow an interaction would ultimately result in either a Grandfather Paradox or a very deterministic fate. Since killing or defeating one's future self doesn't mean that you won't eventually become them, then go back to start the cycle all over again. To give an example (albeit a poorly thought out one), see InFAMOUS. Specifically Kessler, who is simply an alternate version of Cole from the future. In particular, a future where the Beast went on a rampage and he lost everything, a series of events that sparked his desire to go back and interfere in the first place. Besides the mechanics of causality, I think time powers working as you describe is fine. Even if one time travels and makes changes, assuming no branching realities where that change succeeded are created and the timeline one is currently in is altered instead, those with Quantum Shards will remain aware and unaffected by such changes. Since our character concepts are so similar, however, I might just go the straight villain angle and nix the prime part beyond said character wanting to gather more power to prevent their alternate selves from reforging the crystal, keep the current realities as they are, prevent the inevitability of the next loop, etc.