Blood Tax is a Skill in Elden Ring. Blood Tax is a regular skill that can be found in Ashes of War, this can be used on armaments capable of thrusting (Colossal Weapons excepted). Updated to Patch 1.07.

Elden Ring Blood Tax Guide, Notes & Tips

• This is an Ash of War Skill, associated with the Ash of War: Blood Tax.
• FP Cost: 14 on use.
• Deals 16 stance damage
• This Skill is not Chargeable
• All 4 separate thrusts can be Parried
• Upon activation, the user prepares their armament while performing a spin, before unleashing a quick flurry of thrusts in front of them.
• Deals 88+44+44+110 MV (Motion Value) of damage for the 4 hits of the combo respectively.
• Applies 100+50+50+100 status effect MV (Motion Value) for the 4 hits of the combo respectively, averaging out to 75% of normal status effect buildup compared to 4 normal light attacks, though at a much faster rate when used on heavier and slower weapons.
• Restores 2% + 25 on the first 3 hits and 4% + 45 HP on the final hit for a total of 10% + 120 HP.
• This weapon skill does not innately have any status buildup, but will apply respective buildup per hit if the weapon has it (either through weapon buffs, or innately).
• Because of the possible stagger on light enemies pushing them backwards, it's suggested to perform the skill as closest to the enemy as possible to make all hits count.