Form blood, within a 60ft from the chosen point, into 3 inch thick 1ft by 5ft panel of blood. Each 50 gp worth of blood you use adds another 1ft by 5ft panel.

Any creatures of choice within 10 ft of the wall make a constitution check, on a failed save they take 3D6 + your spellcasting modifier, necrotic damage and add 1ft by 5ft to the panel, on a successful save they take half the damage and don't add to the wall. A creature without blood automatically succeeds

The wall doesn't have to be straight or vertical.

The blood in the wall can be taken for other spells, but every 50gp makes the wall smaller by 1ft by 5ft. If another creature takes the blood using a spell they must make a skill check using their spellcasting modifier (against your spell save). You can be willing.