IMO, Zither! is more overpowered than the Arcane Warrior. He has better survivability without the need of barrier, has better AoE attacks and has better ranged options. (And he's the only character which can survive to a RT shadow backstab!)
Wave 3 and 4 were done in the open, with a 70 killstreak and 76 killstreak, respectively. Here's the full video:
A run done correctly could take under 20-ish minutes.
Stats = 13 consitution, 73 willpower, 33 cunning
Build used:
I've done a lot of testing over the last few days in order to find exactly how each ability works. Here are my findings:
- Barrier is completely unnecessary as long as you use "A Little Knight Music" and "Fortifying Arpeggio". Keeping "A Little Knight Music" as an active status and continually casting songs will reduce most, if not all physical damage received to 1 if done correctly.
- Therefore, "Strength of Spirits" and "Knight-Protector" aren't needed for soloing.
- "Cool Beats" is extremely effective when used with the passive "Long Solo". Duration is increased to 12 seconds; the single target damage is increased from 2400% to 3600% and the AoE damage from 1200% to 1800% wep. damage.
- "Cool Beats" cannot be stacked on single targets (because it is similar to a status effect), but the AoE damage can be stacked by applying Cool Beats on multiple enemies in the same 4m area.
- Winter Music is essential, as it reduces incoming damage up to 30%, and using the Cool Beats + A Little Knight Music combo will always keep a 10% active reduction on damage.
- "Inferno Music" (+10% dmg for each fire chord) only works "on cast", which means it only applies to the first 'tick' of Cool Beats, and is therefore worthless unless you also use 'Power Chord' and/or "Hot Licks" in your build.
- "Blood Frenzy" and "Conductive Current" work correctly with every 'tick' of Cool Beats. Keep your mana low to deal as much damage as possible.
- "Blood Frenzy", when used with Cool Beats, can help you self-revive extremely efficiently. In fact, being at 0% health will make all 'ticks' from Cool Beats deal 50% more damage, aiding you in self-revival.
- Killer Set doesn't seem to work with the 'Barrier' song, so if you need to generate a lot of 'buffer damage', make sure to use other songs
From all testing I've done, the linked build is by FAR the most effective build for soloing. If I ever happen to complete a full solo run, it will undoubtedly make use of the same build. Feel free to ask questions or add suggestions.