Your base health is 60.

Whenever you fail a precision roll, you can sacrifice 5 health to increase the result of that roll by one. You can do this multiple times per failed roll.

In addition, whenever you spend any amount of energy, you are healed for that amount.

At the start of a round, you can sacrifice 5 health to gain 10 temporary health for that round. This effect is clearly visible to other creatures.

As a rapid action, you can sacrifice 5 health to increase your aptitudes in one of the following ways, until the end of this round:

When you are at or below 15 health and use an ability that costs health, you can instead spend 1 energy per 5 health cost to use that ability.

Target a creature as a full-turn action and make a precision roll against their Constitution. This will alert the creature to your location.
If you succeed, sacrifice up to 30 health. This creature takes armor-ignoring damage equal to the amount of health you sacrificed.
This ability does not get any bonuses to its damage.

Category: Defense
Against: Warding
Execution Time: Action
Cost: 5 health
Range: 5 meters
Effect
Steal 10 health from the target creature. Potency bonus to this technique's damage is halved.

Category: Utility
Execution Time: Action
Cost: 2 energy
Range: 1 meter
Duration: (1 + C/4) hours
Effect
You can precisely manipulate a lifeless object smaller than (15 + C) cubic centimeters. You can apply one of the following:
1. Change the shape.
2. Shrink down to at most half size.
3. Enlarge up to double size or 25 cubic centimeters, whichever is smaller.
4. Cut or open holes.
This object returns to its original shape and properties after the duration. This ability can't be used on magical items.

Category: Offense
Execution Time: Full-turn action
Cost: 2 energy
Duration: (3 + C/2) rounds
Effect
Enchant a weapon you can touch with the aura of the underworld for the duration.
If the weapon kills a creature, a spiritling of chaos is summoned for 2 rounds. The summoned spiritling shares your level, counts toward your summon limit, and takes its turn right after the weapon’s wielder. The wielder can command the spiritling to attack a creature as a rapid action.
This technique can also be used on a weapon wielded by a creature within melee range.

Category: Offense
Execution Time: Full-turn action
Cost: 15 health
Radius: (2 + P/3) meters
Duration: (2 + C/3) rounds
Effect
Create an area of darkness around you. This area is considered quarter cover and is light rough terrain.
Summon a spiritling of chaos next to each creature hostile to you within the radius up to a maximum of (2 + P/3) spiritlings for the duration.
Spiritlings summoned by this technique share your level, do not count towards your summon limit, and attack the creature closest to them.

Category: Offense
Against: Constitution
Execution Time: Rapid action
Cost: 2 energy
Effect
Touch a creature, and transfer a debilitating or harmful status effect from yourself to this creature.

Category: Offense
Against: Warding
Execution Time: Action
Cost: Special
Range: 5 meters
Duration: 3 rounds
Effect
Mark up to (1 + P/2) creatures for the duration, spending 1 energy per creature marked. If a marked creature dies while affected, adjacent creatures take 10 magical damage without requiring precision rolls.

Category: Offense
Against: Constitution
Execution Time: Full-turn action
Cost: 10 health
Range: 5 meters
Effect
Deal 20 magical damage to the target creature.
At the start of your next round, unless the creature has died, this damage is reversed and the creature regains health equal to the damage it received to its health.

Category: Offense
Against: Warding
Execution Time: Action
Cost: 5 health
Range: 5 meters
Effect
Remove (1 + P/4) supportive status effects from the target creature, then deal a combined 10 magical damage per effect removed.

Category: Offense
Against: Constitution
Execution Time: Action
Cost: 10 health
Range: 5 meters
Radius: (1 + C/2) meters
Duration: Special
Effect
Debilitating and harmful status effects that the target creature is affected by spreads to the creatures within the radius around it with their remaining durations. You can choose to reduce the radius of this ability when you use it, to a minimum of 1 meter.

Category: Offense
Against: Constitution
Execution Time: Action
Cost: 2 energy
Range: 5 meters
Duration: (2 + C/3) rounds
Effect
Apply either sickened or weakened defenses to the target creature for the duration of this technique. Alternatively, you can apply fatigue by spending 4 energy instead.