Reproduction Steps:
In practice mode, just using Overlord, and then comparing it to an equal 40 physical power to see if the Cleave passive on Overlord is working as intended.
Expected vs. Actual Behavior:
I expect the passive to do more than 2 extra damage. Or if it's only supposed to apply on enemies around the aoe (which i'm pretty sure it isn't), then why is it adding 2 extra damage? Might be crazy here, but my calculations for level 6 and with Overlord's passive with Rampage's stats should add 79.925 damage before damage mitigation on the Colossal Cleave passive.
Screenshots/Videos:
The clip shown below. I use Overlord, does 74 damage, I get 40 physical power to match the base 40 physical of Overlord and it does 72.
Game Version and System:
On the Epic Games version and playing on patch 1.5.7.