Time

Kurogane Kuroha, he is the God of Clockworks and his main ability is "Time". His ability doesn't stop at being to go back to the past or stop the time. His ability has many branches: 

Re; Call - The very first power of Kuroha which came from Iroha before she died from a cancer disease. Re; Call can go back to the past whenever the caster wanted it to but Re; Call has many demerits. It can only go back to the past and once the caster goes back, they can't return to the future. No matter what the caster does, they can't change the future. After many uses, the percentage of the caster going insane goes up to 99%. 

Re; Write - This ability can overwrite or erase all the possibilities in to one. This ability can be imagined as playing a fighting game and pausing before the enemy hits you then replace their pose to the way it's better for you to beat the enemy.

Fragmentation Dream - It's a hard cover black book with golden engravings "Fragmentation Dream". The pages are infinite and the pages are blank which when a thing or a wish is written on it, it will happen. This was used in different way by Lillian to make a fake world for Kuroha and recorded his life which angered Kuroha for fabricating his life. Fragmentation Dream was stolen by Lillian and it's currently her property now. 

The Izumi Series - The Izumi series is 5 possibilities of Izumi that had been accidentally pulled out by Kuroha when he finally found out what Izumi had done. Kuroha can summon The Izumi series anytime he want. 

Timepiece - This ability is gonna be introduce in After Rain Dream: The Miniature Garden.

Next Up: Mashiro's Strongest Spell: Reron 

Author's Note

Hope this gives you example of how Kuroha's power is