Alright so i narrowed it down to this idea.
Boots give you 5 flat health regen as a raw stat. _(going with flat instead of % since it does not give you hp/ intended for champions which soso hp, that want to get more our of their resistances). _
It has a storable bank for up to 250 points. this bank fills at a rate of 25 points per 5 seconds. takes 50 seconds to fill it.
This 250 bank can only go towards replenishing grey health.
Only once it reaches 250 can it be used / "expended", happens automatically.
Lets say you incurred damage and your deemed in battle. You will have grey health for up to 250 hp worth. Once out of battle the stored health gets used automatically if you did not use your active shield to fill up the stored health (you'd use shield if you need it immediately on site).
While expending the stored 250 points it will refresh grey health at a rate of 75 health per 5 seconds.
with the 5flat thats 80 health per 5 seconds so about 15 seconds to restore the grey health.
{quoted}
Garen would be Op
Imo regen should have a cap for these types of outliers/exceptions.. like we have for attack speed.
But even so I still don't think it would be op on him. Cant tell until its tested. Its also a misconception of sort to say this since nothing is op if the numbers are low.
{quoted}
I think Bloodthirster shield is enough. Too similar. And we don't need to copycat a champion's mechanic.
I do think it would be pretty distinct from blood thirster. For one only so much you can do with a bar so you'll see similarities with anything you do.
Blood thirster works when engorged this doesn't. Lifesteal works when you deal damage this doesn't.
This shield decays the instant its triggered too.
Also cannot expend the stored points while on cool down.
Recap:
Active something like say:
receive shield that fills up your grey health up to 250-300 strength which decays over time. (this can be balanced by adjusting how fast it decays). (Maybe first half decays at rate of 150 in 2 seconds. And the other 150 (out of 300) decays overs 6 seconds.) Good at mitigating burst, so time it right.
Cooldown perhaps 50 seconds?