ICD of 1 second.
Buff dmg by like 20-30%.
For the same reasons Auras/Armors were given a 1 second ICD.
Retaliation has been/is very binary, using it often doesn’t feel that rewarding, and using any sort of fast attack against it is infuriating and sometimes impossible (flamethrower). And ever since 2 second cooldowns were slapped onto the on crit Sigils around release, there isn’t much benefit for a rapid-hit attack to be rapid-hit.
The change, with the dmg buff, would hopefully make it a little better against slower attacks w/o being absolutely broken against any sort of multi-hit attack.