"Grounded" needs to be everywhere. Every slow should include it.

Please do not make this like Veigar's cage where he gets unique functionality that NEEDS to be global.

Every kind of slow needs grounded added to it. Further, this does not require a mass rebalancing; nonmobile champs get this "for free" because mobile champs have been jumping through walls for free for years now. Essentially, the definition of slow should become "moves slower and cannot use movement abilities", making it actually relevant.

This could actually be a turning point against the league of mobility strangling the life out of this game, but only if it is utilized correctly; ie. as often as possible, preferably everywhere. (The only advantage already mobile champs get with grounded is against other mobile champs; their interactions with nonmobile champs do not change.) But if only Cass can do it it's (almost) completely worthless. This could be big, Riot. Please impress me.