Flash and Mobility Creeping
Right off the bat this is essentially a straight up nerf to the spell in hopes that more spells get more tempting to use because of this. Now the fundamental usage of Flash being either an escape or initiate tool will remain, but no longer a free cast but simply a spell that can be used when within range of an enemy champion and becomes either an escape tool or initiate tool based on how close or how far you are from the enemy champion. Also Flash will no longer be an instant teleport but instead a unique dash, fundamentally will be the same thing as an instant teleport but with a dash animation for clarity purposes and nothing else; I will explain why it is a unique dash in a bit. Also I will introduce a free item that is an active only and can be combined with any tier 2 boots as an ultimate solution to deal with the mobility creeping in the game, this nerfs the mobility champions and buffs the non-mobile champions, excluding mobility through movement speed.
Flash: Passive: Gain a feint halo around you that indicates a 500 units radius when within 1000 units of an enemy champion.
Active: Perform a 500 units unique dash. If you are less than 500 units away from an enemy champion then you dash away from the enemy champion; if you are more than 500 units away then dash towards the enemy champion. (1000 units range) (300 seconds cooldown)
Unique dashes cause you to become untargetable and invulnerable, become immune to Pursuer's Cuffs and Azir's Emperor's Divide, and is not interrupt-able while the dash animation is in effect.
Pursuer's Cuffs Recipe: Free; may be combined with any tier 2 boots however.
Statistics: UNIQUE Passive - Cuffed: Basic attacks mark enemy champions for 3 seconds, if a marked enemy champion dashes or instantly teleports then Pursuit may be used. The summoner spell Flash does not trigger Pursuit.
UNIQUE Active - Pursuit: Instantly teleport to the closer and eligible marked enemy champion's location being placed at your maximum basic attack range (45 seconds cooldown). This active cannot be used if the enemy champion is within your basic attack range.
If your placement would be impassable terrain then you are placed on the side of the terrain that is closer to the escaping target.
Hope you appreciate the ideas, and yes if you ever played League of Legends before or even watched the game you should know why Flash needs to be taken down a notch, I prefer a Flash removal honestly. Pursuer's Cuffs should help indirectly nerf the mobility creeping in the game having an item that can chase down all these champion that can run through walls.
~ Stacona