Gho'Kaw the Riftmaker is a custom champion that would be nice to have in League of Legends. I'll edit this later, but right now, I have no time. Sorry!
Straight to the Void
COOLDOWN:15 / 12 / 9
Gho'Kaw periodically makes a small portal on himself, with a maximum of 1 / 2 / 3. The next attack from a large minion, large monster, or champion is completely mitigated and consumes the portal used.
COST: 30 / 40 / 50 / 60 / 70 mana
COOLDOWN: 12 / 10.5 / 9 / 7.5 / 6
Active: Gho'Kaw, given Straight to the Void is up, places a portal behind target enemy Champion. The next attack within 5 seconds that goes through a portal comes out the second portal, dealing all of the damage and applying on-hit effects the attack usually has, along with bonus magic damage.
Allied champions may attack Gho'Kaw during this time. If the active goes away while an ally is attacking Gho'Kaw, the attack does no damage, doesn't consume an extra portal, and the ally champions' auto attack timers are reset.
COST: 50 / 55 / 60 / 65 / 70 mana
COOLDOWN: 20 / 18.5 / 17 / 15.5 / 14
Active: Gho'Kaw creates a rift under target ally Champion for a few seconds, giving them bonus Armor and Magic resistance, as well as AoE mitigation, for a few seconds.
Armor/MR: 10 / 15 / 20 / 25 / 30 (+ 15% AP)
AoE Mitigation: 15 / 20 / 25 / 30 / 35
Duration: 4 / 4.5 / 5 / 5.5 / 6
COST: 60 / 70 / 80 / 90 / 100 mana
COOLDOWN: 14 / 12 / 10 / 8 / 6
Active: Gho'Kaw conjures a semi-permeable rift at target location. After a 0.625 delay, the void creatures on the other side unleash their powers through the rift, dealing magic damage and slowing enemies for 1.5 seconds.
Damage: 70 / 110 / 150 / 190 / 230 (+ 60% AP)
Slow: 30 / 35 / 40 / 45 / 50%
RANGE: 500 / 625 / 750
COST: 100 mana
COOLDOWN: 150 / 120 / 90
Gho'Kaw creates two portals
If ground-targeted, then Gho'Kaw creates a portal at target location and 50 units in front of Gho'Kaw.
If ally-targeted, then Gho'Kaw and target ally champion are suppressed for 1 second, then both use the portals and are healed.
Heal: 100 / 175 / 250 (+ 65% AP)
If enemy-targeted, then Gho'Kaw and target enemy champion are suppressed for 1 second, then both use the portals. The enemy champion then takes magic damage and Gho'Kaw is healed for that much. Gho'Kaw is also immune to damage and CC for a short time afterwards (not the Nexus Obelisk, this is not THAT kind of custom champion.)
Damage: 75 / 175 / 275 (+ 55% AP)
Immunity Duration: 1 / 1.25 / 1.5
Regardless of target, the two portals last for a short time. During this time, anyone may use the portals by right-clicking on it. The portals cause the champion to vanish for 0.25 seconds before reappearing at the other portal. After using a portal, champions have to wait a few seconds before being able to use it again. If an enemy with Gho'Kaw's Q on him is to use the portals, any damage that would be taken from that Q in the next 2 seconds is converted into true damage instead.