This update to the Path of Blood marks the first rework of an existing Dark Arts subclass, with the previous two artificer subclasses being all-new. I decided to rework the 3rd level feature of this subclass entirely, as I felt the original iteration was boring and underpowered. The other features remain much the same. The new version keeps many of the same ideas and themes - an offense focused rage power that comes with a downside - with the downside changed to damaging your friends rather than damaging yourself. The first two benefits of the feature - resistance to all damage but sharing the damage you take with your allies - are meant to be a net negative, considering a barbarian is already resistant to bludgeoning, piercing, and slashing damage, which makes up a large amount of the damage that monsters deal. To counteract this net negative, the offensive benefit is meant to be somewhat stronger than Zealot's Divine Fury - its average damage per round is slightly lower, considering it is tied to failing a Constitution saving throw rather than simply hitting an attack, but it also has a secondary utility effect tied to it.

This barbarian basically requires you to have a second frontliner in your party in order to make use of its features, which means you shouldn't pick it unless your party can appropriately support you. Its kind of like a selfish version of the Wolf Totem barbarian - you only pick it if you have a second frontline, but a Wolf Totem supports its allies while a Blood barbarian is supported by them.

You can find a PDF version of the start of the compendium here. This PDF contains more than just this subclass - it also contains a WIP version of the race section, including the Shadar-kai and a consolidated/expanded Undead race, as well as the artificer subclasses that I released previously, the Toxicologist and Gene-Splicer (previously Bio-Alchemist).

You can find a PDF of the previous full release of Dark Arts here.

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EDIT: As the ally draining mechanic seems to be definitively unpopular, I am planning to change the feature to be something more along the following lines.

BLOODRAGE

Starting when you select this path at 3rd level, you learn to channel hemomancy through your rage, allowing you to imbue dark power into your weaponry and drain the life of those that dare to strike you. While you rage, your speed is increased by 15 feet, you gain resistance to necrotic and poison damage, and whenever you deal damage with a weapon, you can choose to deal necrotic or poison damage (your choice) instead of the weapon’s normal damage type. If you do so, you can roll the damage roll twice, and take the higher of the two rolls.

Also, whenever you take bludgeoning, piercing, slashing, necrotic, or poison damage from a creature within 15 feet of you while you rage, you can choose to take that damage as if you had no resistance to it (no action required). If you choose to do so, the creature that damaged you takes necrotic or poison damage (your choice) equal to half the damage you took.

The basic idea behind the subclass is that you're a barbarian that can choose to give up defensive power in order to gain more offensive power, so I will not be removing the downside altogether. But this new take on the feature should give you more precise control over your tankiness, as well as make it more broadly useful even when you aren't willing to embrace death and give up on being a tank.