string

this is what I consider in archetype/feat which means it is a feature that works like an archetype you can use this as a homebrew for the string string fruit from one piece, or as a base for Rui from demon slayer

at level three: The user can produce extremely thin silk like threads that they can manipulate. This allows them to cast puppet strings at will

cutting thread, cage: The users thread is extremely sharp and strong. They can use this to attack. The damage modifier is dexterity, and the damage is one D8 plus dexterity

if you were using this for Rui from Demon slayer, or you are playing some other demon like creature, you can also gain this, you will have advantage on intimidation and will no longer feel pain or get tired, but your body will still be worn out and you will still need to rest. if another person drinks the users blood, they will start to look like the user and gain a weaker version of the users powers

at level five: As your string becomes stronger, so does your body you get a plus one to strength

Murderous eye basket: The user creates a 15 x 15 box around a creature to escape The creature must succeed a strength, DC of 15 if a creature touches the string it takes one D8+ the users dexterity modifier As a bonus action, the user can choose to shrink the box by 3 feet

at level 10: The user can now sacrifice some of their own blood, taking one D 10 necrotic damage this lasts for one minute (10 rounds) doing this affects the two attacks differently

Cutting thread, cage: All damage done by the user is doubled

Murderous eye basket: The DC to escape is now in 18 and all damage done by the attack is doubled