How can I make a spell "return damage" like Blade Mail in DotA?

[UngThanhNhan]

Thorns Aura: this spell has just returned melee physical damage. I want to make a passive spell like Thorns Aura but it can return all damage (physic, magic,...). It is like the spell "return damage" of Blade Mail in DotA... Show me how to make it?
thanks for all helps !!!

 

[Doomlord]

https://www.hiveworkshop.com/forums/world-editor-help-zone-98/blademail-192570/

 

[Chaosy]

download a damage detection system
set reflected damage to 0 in the object editor

use something like
dds event becomes equal to 1.00
damaged unit got buff thorns aura
unit - deal damage to source

1900

 

[neo_sluf]

use thorns aura..

 

[Shade Da Scout]

download a damage detection system
set reflected damage to 0 in the object editor

use something like
dds event becomes equal to 1.00
damaged unit got buff thorns aura
unit - deal damage to source

use GUI Damage Engine v2.2.1.0

When a unit with "blademail" buff takes damage, deal damage equal to dealt damage to damage source.You should base this ability on Berserk.

example:
far seer cast chain lightning on a Troll who activated Blademail (berserk)
both far seer and Troll will take 200 damage (dealt damage)
far seer-damage source
Troll-damage taker (with blademail buff)