Idea for new Resolve Keystones

All of Resolve's Keystones encourage you to engage with the enemy, but they aren't that good at making you tanky in the process or helping you stop enemies. Aftershock is useless and Guardian doesn't work top, so I had some ideas about Keystones to help make top lane tanks more powerful.

Shield of Iron After not taking damage from enemy champions or large monsters for 10 seconds, gain a shield. This shield will be 5% of your maximum health and grant you 5% damage reduction (scales with bonus armor up to 55% at 500 armor). After the shield is removed, the damage reduction reduces at a rate of 5% each second. Cooldown: 90-30 seconds (reduces with level)

Prison of the Ground After hitting an enemy champion with 3 attacks or abilities within 5 seconds they are grounded for 1-2 seconds (scaling with level) + (scaling with bonus health exponentially [500 bonus health grants 0.25 seconds, 1000 grants 0.5 seconds, 1500 grants 1 second, 2000 grants 2 seconds and evens out with every additional 500 health granting one additional second])

Cooldown: 60-20 (reduces with level)

Numbers aren't exact and might need to be changed.