Here's a build based on doing damage only with the Hero's Sword - time to kill was a little long, mostly because of all the dodging / having to reposition as the melee swings take you too close to the boss; but it does decent damage, and outside of challenge runs, it may also see some use in coop as a team buffer / enemy debuffer, with its bleed and corrode applications.
Build:
Osseus Set // Abrasive Amulet // Razorstone + Ring of Elusion
Hero's Sword
Song of Swords + Hunter's Mark
Osseus + Razorstone means your Bleed ticks are ramping up your Osseus, which then boosts your Bleed ticks. *synergy*. Abrasive Amulet applies your corrode for you at distance, with further buffing through Hunter's Mark and Song of Swords.
The key item here is the Ring of Elusion - Hero's Sword consumes stamina for charged attacks, meaning you can only get 3-4 hits in before running out, depending on your encumbrance / stamina levels. BUT Ring of Elusion refunds your spent stamina on perfect dodge, and also gives you 10s of unlimited stamina - perfect for spamming those charged attacks.
NB: The sword's charge attacks don't seem to follow the usual combo multipliers, so there's no real advantage to using neutral counters or trying to complete the 3-hit combo for the higher multipliers.
![](https://i.ytimg.com/vi/HzuzFJntd9I/maxresdefault.jpg)