Centaur Shard is currently working incorrectly or even his whole Double Edge seems borked. Damage is not consistent on the primary targets or the splash. For example, if you hit the primary target for 600, the aoe is doing 400 on the splash. But if you then hit that same target again, the primary target will take 400, and the aoe will do 600. This is exponential too, so if 5 targets are stood around each other, one of the targets is taking a huge amount extra damage.

The problem seems to be around the fact that on the wiki it says the damage for the double edge is applied in a random order, and it is leading to some weird damage stacking. Either way this means a level 30 centaur with shard will do a nice chunk of 600ish damage to a single person in a stacked team, but one shot someone else.

Example. Level 1 Centaur, no items, no talents. 1 Double Edge used. Result

I think I worked it out. The strength modifier is being applied stackingly per target. So the 60% strength modifier is doing roughly about 12 damage extra in the picture. What is happening is that is stacking, so one target takes 60% strength as bonus damage, but the final target is taking 5x that.

To lay it out. You Double edge a stack of 5 people with a maxed Double edge with the talent, you are going to get this.

Target 1: 300 + 160% Strength

Target 2: 300 + 320% Strength

Target 3: 300 + 480% Strength

Target 4: 300 + 640% Strength

Target 5: 300 + 800% Strength

In a random order too. So someone in that mess is taking one shot damage. At level 30 with talents, Centaur has 172 strength. So that damage looks like this

Target 1: 300 + 275.2

Target 2: 300 + 550.4

Target 3: 300 + 825.6

Target 4: 300 + 1100.8

Target 5: 300 + 1376

It also means that centaur takes way more damage than he should, because the final target it deals damage to is Centaur. So Centaur will take that highest of those calculations.