Implement Transfigured Black Wakizashi

Original:
```
Your Primary has a 30% chance of dealing an additional 3 blows, dealing 50 damage each, in a radius around your target enemy.
```

Ideas:
```
When you use an ability or loot item with a cooldown, your next Primary deals an additional 3 blows, dealing 50 damage each, in a radius around your target enemy.

When a % chance succeeds, your next Primary deals an additional 3 blows, dealing 50 damage each, in a radius around your target enemy.
```

See https://github.com/Hejsil/TransfiguredLoot/issues/441