I'm tired of seeing so much 
.
Let's add some variety here.
My suggestion: "earthbound"
Earthbound targets an enemy champion, slowing them by 25% and grounds them by 2.5s
Effect can be removed by 
Cooldown: 180s Range: 650
Discuss!
DuskDaUmbreon2 votesNot very distinct from 
.
Having a grounding isn't enough to make up for the loss of the 40% damage reduction and 5% less MS reduction.
Also, no. Universal grounding is not the answer to mobility any more than universal GW is the answer to healing. GW has resulted in healing being buffed to where it's OP if the enemy has no GW, but still isn't relevant if they do have it. Making grounding readily available would just result in mobility getting the same treatment.
Verxint1 votesThe difference is that healing is just a number comparison, while mobility is (as much as it hurts to say) a form of interesting interaction between the two champions.
Agent Corgi2 votesSo it's like Exhaust but instead of reducing the damage you take from the target, you inhibit their Mobility instead. Would be a pretty good Summoner to take if you had to go up against a champion who can jump all over the place, For example, I can definitely see a Support taking this if the enemy team has an ADC with a Mobility spell like Lucian or Ezreal.
Verxint2 votesI don't know about this exact implementation, but a grounding summoner would probably be a great idea
BigFBear1 votes2,5 second root is waaaayy too strong in comparison to other summoners.
Evíl cookie2 votesit's not a root... groundend Champions are not able to use movement spells/abilities - everything else is possible. Thats a huge difference.
KFCeytron1 votes[{quoted}](name=Evíl cookie,realm=EUW,application-id=3ErqAdtq,discussion-id=V8QHj7n3,comment-id=00030000,timestamp=2019-01-17T07:43:30.657+0000)
it's not a root... groundend Champions are not able to use movement spells/abilities - everything else is possible. Thats a huge difference.
It's a ground and a strong slow, similar to Cass's E. People caught in that basically aren't going anywhere. Putting that on a targeted, ranged, instant spell would be way too strong, although I can see it being sort of okay on a completed item that costs 2-3k gold.
Evíl cookie1 votesIt's single target with a long cooldown. There is counterplay (, qss, certain abilities (Olaf r),...). And you can still fight with this (no damage reduction) effect.
I think it's fine.
KFCeytron1 votes[{quoted}](name=Evíl cookie,realm=EUW,application-id=3ErqAdtq,discussion-id=V8QHj7n3,comment-id=0003000000000000,timestamp=2019-01-17T09:11:07.265+0000)
It's single target with a long cooldown. There is counterplay (
Imagine that this goes live. You're in mid and facing, say, a Zed. What are you going to bring besides Flash? Ignite, to do a few hundred true damage before he blinks away after his combo? Exhaust, so he needs to blink away after his combo and then wait 20 seconds before going in again to kill you? No, you're gonna bring this ground/slow and hit him with it before he can blink away, causing him to die to your turret, team, combo, etc. And maybe your ADC will bring this spell, too, because the ADC is a high-value target for an assassin.
Assassins would eventually realize that if they can't delete someone in a fraction of a second, they are unviable, because they'll have no escape tool and will only be able to trade a kill for a death rather than pull ahead. So, what happens to keep assassins viable? They receive buffs until they can reliably do their job and actually help their team. The result: all assassins can kill you before you can react.
Do you know how many buffs Kat in particular would need if this spell existed?
Evíl cookie1 votesImagine that this goes live. You're in mid and facing, say, a Zed. What are you going to bring besides Flash? Ignite, to do a few hundred true damage before he blinks away after his combo? Exhaust, so he needs to blink away after his combo and then wait 20 seconds before going in again to kill you? No, you're gonna bring this ground/slow and hit him with it before he can blink away, causing him to die to your turret, team, combo, etc. And maybe your ADC will bring this spell, too, because the ADC is a high-value target for an assassin.
He can simply take as summoner spell or build qss. He just has to think of which summoner spell his opponent has, if it is on cooldown and how risky it is to go all in and dive under turret. This summoner spell has a long cooldown - feel free to abuse this. Cassiopeia is much stronger because you can't use or qss or ...
This summonerspell helps you to survive or to catch a (high) mobility champ.
KFCeytron1 votes[{quoted}](name=Evíl cookie,realm=EUW,application-id=3ErqAdtq,discussion-id=V8QHj7n3,comment-id=000300000000000000000000,timestamp=2019-01-18T10:13:48.158+0000)
He can simply take
This summonerspell helps you to survive or to catch a (high) mobility champ.
It does more than help you survive and catch; it wrecks champs that depend on mobility. They'd need a significant buff to deal with a targeted "you're a diver now" spell.
Cass's W isn't an instant targeted spell.