Keystone Rune Idea: Stoneborn Pact
Since Riot's current meta doesn't really include most tanks, I think that giving them more runes to help then would be really good! The concept for this rune is simple. It's just a numbers game to balance:
Immobilizing an enemy champion marks them. If an ally auto attacks them they are pulled into the ground, being untargetable and stunned for [0] seconds. [40] second cooldown.
https://imgur.com/a/7mRz1Yj
I think this rune would help tanks in a way that isn't annoying to the other team. If you can't be damaged while you are CCed it could potentially lead to some really cool plays involving holding someone like a carry hostage for a time while your team chips away at the rest of the enemy team. Another great feature of this rune is that realistically it can only be taken by tank junglers and tank supports (so it will be really simple to keep balanced). This is because it has to be procced by an ally. It gives the CCed player some time to think about what to do and the enemy team some time to retaliate.
And yes. The name is a reference to the old mastery Stoneborn Pact. I love seeing the old rune names being reused. A lot.