I thought the throwing blades upgrade didn't do anything.
ROFL I would stop playing SS right away if the throwing blade upgrade don't work any more. You would never consider anything else once you realise her damage potential. The damage bonus applies to all damage sources for a brief duration following a throwing blade hit. And instead of giving 25% dmg bonus per hit, it actually increases the damage in a weird exponential way. It pumps the damage up from 2k to 5k to 12k to 20k per hit... Seriously she is a ******* monster.
You can pretty much insta kill any boss even on HB (if they would stand still for a moment). You can pump your damage to 20k + per hit on NM dragons (did this when I had just over 80 willpower. Killed the dragon before it took off). Pair up with another SS and alternate throwing blades between each other and you will 1 shot any mob on NM with a single skill, using each other's throwing blade effect.
The most OP skill in game combined with flow of battle. It's like a super buffed version of Mark of Death.
It's so sad people still assume the upgrade remain bugged and just don't invest a point on the upgrade
So much wasted potential.