Blood is one of the two available skill trees for the Rapier Mastery in New World Blood Abilities mainly focus on boosting the player's offensive output but also in causing Bleed or Rend. Rapiers mainly benefit from Dexterity, but Intelligence also contributes although on a secondary level.
All Blood Tree Abilities in New World
Blood Tree Active Abilities

Tondo
Slash so quickly that it extends the reach of your blade up to 5m. This strike deals 50% weapon damage and applies a bleed that will deal and additional 85% weapon damage over 12s. This bleed can stack up to 3 times, refreshing previous applications.
6s Cooldown
Upgrades:
Thirst For Blood: When applying the first bleed stack to an opponent this cooldown is reduced by 10%.
And Again: If you hit only one target, even on a blocked hit, this cooldown is reduced by 25%
Proper Spacing: Improve your direct damage from Tondo by 100% if you are 4m away from your target or more.

Flurry
Enter a posed stance and unleash a series of five quick thrust attacks with each strike dealing more damage. Flurry can be dodge canceled at any time.
Cooldown: 16 seconds
Upgrades:
Overwhelm: Each hit of Flurry does 25% more block damage.
Fleeting Strikes: Each hit of Flurry reduces the cooldown of this ability by 7%
To the Bone: Each hit of Flurry extends the Rapier's bleed by 1 second. This wil also apply to future stacked applications of the same bleed, extending the entire stack
Finalize: The last hit of Flurry will cause the enemy to stagger

Flourish and Finish
Flourish performs an attack, knocking back enemies. Pressing 'Light Attack' at the end of Flourish will continue this ability by automatically performing 'Finish'. Finish lunges forward, consuming all Rapier bleeds on any target hit, dealing 110% of their damage immediately.
Cooldown: 20 seconds
Upgrades:
With Flair: Gain Grit on both Flourish and Finish.
Swagger: +20 stamina when succesfully hitting a target with Finish
Fuel: Each tick of damage from Tondo's bleed reduces the cooldown of this ability by 3.5%
Bloody End: Finish deals 150% of the Rapier's bleed damage instead of only 110%
Blood Tree Passive Abilities

Refreshing Strikes
Reduce all cooldowns by 1% on any hit.

Unerring
Deal 5% more damage to targets with a Rapier bleed.

Heavy Puncture
Any heavy attack on a bleeding enemy will extend their Rapier bleeds by 2 seconds. This will also apply to future stacked applications of the same bleed extending the entire stack.

Engarde
Deal 10% more damage when your target has greater than 50% health.

Light Edge
Increase damage from both middle swipe attacks in the light attack chain by 8%.