For those who don't know, Daughters of Ash is a HUGE mod that completely changes the way Dark Souls 1 is played. Almost all locations are renamed, new bosses, existing bosses are modified, new quests, new items, new weapons, new spells, different intended order of progression, etc. This is on the Prepare to Die Edition so that I didn't have to worry about getting banned.
This is a special boss fight that, if you progress through the quest properly, you get to unlock. The fight starts off as you vs Sif, but at half health Artorias himself jumps in and now it's you against both! Damage Artorias enough (or kill Sif) and the fight shifts to a red phantom version of Manus where you are AIDED by white phantoms of Artorias and Sif. The icing on the cake is that the boss soundtrack is none other than Slave Knight Gael's boss music from Dark Souls 3. This fight alone makes the mod worth trying out.
![](https://i.ytimg.com/vi/D3crhmrMqsk/maxresdefault.jpg)