Sáralissë - Blood Kinship

A homebrew feat for a warlock entwined in love, memory, and shadow.

You carry your blood like the precious light of a lantern in the dark. It remembers pain, love, and promises—especially the broken ones. You gain the following abilities:

1. Ribbon Vein (Reaction, 3/Short Rest):

Whenever you are bleeding and a creature within 30 ft of you takes damage, you may extend a filament of your own blood to touch theirs. Threads of crimson arc from your skin, like silk pulled through air, forming a Sáralissë (sah-rah-lease-e) or Blood Kinship and forces the target creature to make a Charisma saving throw, which they can elect to fail. On a failure, you choose the bond’s effect:

• Cradle Thread: Both you and the target gain temporary hit points equal to your Charisma modifier + your Warlock level. You gain one level of Sárenca (sah-ren-cah), or the Blood's Demand. (see below).

• Cut Thread: For up to 1 minute (concentration), you deal necrotic damage equal to your proficiency bonus to the bonded creature at the start of each of their turns. You regain half this damage as temporary hit points. The creature may repeat the saving throw at the end of each of their turns because you make take that healing every turn as a Reaction.

• Nightmare Thread: Your blood lances at a target from the shadows, either triggering the Wisdom saving throw for spells like Suggestion and Phantasmal Killer or the Charisma save, which offers advantage for other spells or attacks if the target fails.

The Sáralissë bond leaves a mark: both you and the target bear a bloodsigil on your skin until the end of your next turn (you can decide what this looks like). If they attack you, the sigil flares and they take psychic damage equal to your Charisma modifier. When you enchant it, the circlet can bare the bloodsigil instead (serving as an arcane focus).

2. Sáralómë

Locked for now. Need to enchant the circlet.
You are a mighty and powerful creature indeed. As promised, your growth in magic can be combined for devastating effects. From now on, whenever you are bleeding and want to Eldritch Blast, you may choose to combine your blood with your arcana, creating a Sáralómë Blast (sah-rah-loam) or the Blood Twilight, allowing you to add 1d6 at this level, 2d6 at level 12, 3d6 at level 15 and a max of 4d6 per eldritch blast at level 18.

3. Shared Pulse (1/Long Rest or expending a spell slot):

Locked for now. Need to enchant the circlet.
For a creature you share Sáralissë with, you may at any point intertwine your blood with theirs. For 1 hour:

• You always know their emotional state.

• If either of you casts a spell or uses an ability with a range of “self,” the other may be affected as well, as if they had cast it on themselves (once per casting).

• If one of you falls unconscious, the other feels it like a punch to the chest, taking 1 pt of psychic damage as well as Sárenca, and may take a reaction immediately, even if it's not their turn. Ribbon Vein is a Reaction. 

4. Crimson Call: 

Unlocked only with Vanya.
You always know the direction and approximate distance of someone you've bled with (willingly or not), and experience the Shared Pulse bond as long as they are on the same plane of existence. You take half of what they roll on every stress or relaxation check they make. You may suppress this ability with an action if it becomes too much. 

Sárenca - the Blood's Demand.

Blood-letting has a price. Often your victims will pay that price for you, but if you utilize your blood for mercy, the toll must still be paid. 

1 Level: Shadows near her stretch slightly. Her voice echoes unnaturally for a moment. Her heartbeat is audible to nearby allies. If she doesn’t use a different Blood-linked ability on her next turn, she takes 1d6 necrotic damage. If she does, she automatically gains another level of Sárenca. 

2 Levels: Aiano feels a little euphoric and disoriented. Her fingertips stain faintly crimson. When she holds still, butterflies drift around her—whether imagined or real. Disadvantage on Insight or Perception involving non-physical clues and must roll your resilience die for stress on a failure. When you reach 80% stress, you take another level of Sárenca.

3 Levels: In addition to the audible heartbeat, stretching shadows, echoing voice, euphoria, disorientation, and spreading crimson stain, her veins will begin to shimmer visibly like threads of garnet. To others, your aura begins to read a "fey". You can stack 3 levels of Sárenca before you must roll a CON saving throw.

Sárenca Release: On a success, your spell slots and stress levels of all types will reset. You feel momentarily emptied—and terrifyingly clean.

On a failure, she gains one level of exhaustion and has to double her resilience die for a stress check after the spell fades unless she willingly sacrifices something (HP, an item, a memory, bits of flesh, sanity, etc). Each level of exhaustion takes 24 hours to remove.

Arcane Foci

To activate this feature, your Dark Shard Amulet must be synchronized with your Blade Circlet (possibly to be renamed Dark Blade Circlet???). This synchronization binds your arcane focus to your Traveler-granted magic. When crafting spell scrolls or invoking certain Sáralissë abilities, the material component is replaced by the sigil etched into your spellcasting focus. In this case, you must etch the runes from your Dark Shard Amulet into the circlet itself, enchanting it in the process. This act begins a 100-day attunement period—during which you must wear the circlet continuously.

Upon completion, you gain expertise in Arcana. Anyone who attempts to remove the circlet from you once attuned will immediately take 3d6 slashing damage (like Loki shoving his hand into the shard).

You may reduce the attunement period by blood-letting: Each deliberate offering of your own blood shortens the attunement by 5 days, though you risk taking levels of Sárenca and stress. The Blood-Tithe Codex has exercises meant to decrease attunement time as well, with a staggering potential for decreasing the attunement.