Increased damage taken while in enemy turret range
From any source.
This would allow some sort of defense against a 4-man gank besides having your jungler and mid-laner bring teleport.
(assuming it's already in progress.) You can't say, "just have vision." If that worked every time, ganks in pro-play wouldn't be possible.
It'd also pose a threat to squishy champions who are standing under turret with a tank, champions who can remove turret aggro
, and tanks who can take a tower alone while being targeted by it.
