Crimson Stake

After successfully hitting a target with an attack, you may expend your bonus action to attempt to flourish the attack and rapidly inflict bloodloss. A target must make a Constitution saving throw or choose to fail, on a failure their blood erupts and they take 3d6 necrotic damage. Choosing to fail makes it so this damage cannot be reduced in any way. The blood then travels to the casters hand and becomes a weapon of their choice that they become proficient with for one hour or until they stop concentrating on the spell. This weapon must be a mundane weapon that the caster has seen before, and uses their spellcasting modifier for attack rolls and damage. Ranged weapons created this way can make a number of their own ammunition equal to the casters proficiency bonus as a bonus action, requiring the caster to roll a hit die and take the damage rolled. The caster may bleed on subsequent turns to change the weapons shape, rolling a hit die and taking the damage rolled to alter the weapon into a different one.

Weapons created this way have a 10 gp cost for the purpose of spells and abilities requiring one.

When you cast this spell using a spell slot of 4th level or higher, the initial damage increases by 1d6 for each slot level above 3rd. If this spell is cast using a spell slot of 5th or higher, the caster may additionally attack twice with this weapon if they do not have the extra attack feature and the weapon gains a +1 bonus to attack and damage rolls.This bonus becomes +2 upon expending a spell slot of 7th level or higher, or +3 upon expending a 9th level spell slot.