The damage from the 6-pices set of Invoker does not raise when you activate “Reflective Skin”. From the description of this rune I can read that it launches the 300% increse in thorns. So, the damage from 6-pieces set of Invoker shall consiquently be higher by 300%, that is becoming 4 times bigger, but it’s not. Although in other biulds it’s working , in Invoker does not work.
If it is an additive bonus, it may not even be noticeable. If it is multiplicative, it should be.
Seems the modifier is the former.
It’s not additive bonus, it increases the basic thorns 4 times up, it can be seen. If you have 300 000 of Thorns by default, once applying the rune makes the Thorns 1 200 000. That means that the basic Thorns level from which the damage is calculated, is larger, but in fact the damage is not changing. I noticed that half people is using the Reflective skin in Invoker, another half does not, and they are all in top of ladder, because it does not give additional damage. For example, in bombardment sets (akkhan or without sets on) absolutely every player uses Reflective skin - because here the Reflective skin works as it should work logically adding the damage four times up.