That's for the base damage and "bruising" effect.
For the inherent, a lot of ideas have been tossed around, several by myself...right now I'm thinking about this idea (I have no idea if this is possible):
Opportunity - Inherent Timed Toggle Single Target 25% Def and Res Debuff.
0 Activation Time.
Up to 60 seconds duration.
Cooldown unaffected by global recharge, but instead...
Recharge varies based on duration used.
If toggled off before 16 seconds duration, recharges in 5 seconds.
If toggled off between 16 and 30 seconds duration, recharges in 10 seconds.
If toggled off between 31 and 45 seconds duration, recharges in 15 seconds.
If toggled off between 46 and 60 seconds (auto shut off) duration, recharges in 20 seconds.
Toggles off automatically if target dies before full duration or manual toggleoff.