Vret and Reva, the Twins
Lore: Long ago, twin sisters were born to a family. They loved tricking other people with this, and they never got in trouble. As they grew older, they grew more mischievous. Soon their intentions became dark, from theft to murder. Eventually they set off on their own, continuing to cause chaos everywhere they went. They grew powerful together, and for unknown reasons joined the League of Legends.
Abilities:
Passive: Twins: There are two of these rascals, so all stats are divided in two, but they attack the same target simultaneously on your command. But they can take damage individually. They cannot move in different directions yet are a small distance away from each other. You do not die until both twins are killed. If one dies the stats are not put all into one.
Q: Trick: Both of the twins become invisible for 3 seconds, and can move through units during the time. You must attack a target in the next three seconds or both twins will take 60/75/90/105/120 damage. On your next attack only one of the twins will be revealed. The other one will run behind the target and fear them for 1/1.25/1.5/1.75/2 seconds. Cooldown: 13/12/11/10/9 seconds. Mana cost: 35/40/46/52/60 mana.
W: Leap Frog: Target twin leaps to a location, then after 1 second, the other twin jumps over her, going twice the distance. When either lands, nearby enemies are slowed for 50/54/58/62/65% for 2 seconds. Cooldown: 24/23/22/21/20 seconds. Mana cost: 80/85/90/95/100 mana.
E: Dual Strike: Both of the twins shoot energy in a direction, each dealing 45/60/75/90/105 +30% AP magic damage. (Remember it counts for the individual twins' AP). If both shots successfully hit the target then the enemy is stunned for 1/1.2/1.4/1.6/1.8 seconds. This ability targets a champion but shots a skillshot based on where they're about to be. Cooldown: 13/12/11/10/9 seconds. Mana cost: 50/55/60/65/70 mana.
R: Twin Turmoil: Both twins disappear, becoming invulnerable. Then they reappear, and they both attack a target, each dealing 120/200/280 +80% AP to the target. Cooldown: 90/81/72 seconds. Mana cost: No cost