Dome of Pestilence

You choose a point you can see within 50 meters of you. As you begin casting, a dark swirling orb fills the space and a horde of locusts and pests begin to fly around the point in a 10-meter radius harming creatures in the area. The area becomes opaque and there is a 3-meter vision inside it. All creatures moving or starting their turn inside the Dome take 4d4+4 Piercing damage and Bleed(3). If the caster is ever more than 50 meters away from the center, the spell ends, otherwise the effect ends after 3 rounds. The effect may be extended on the turn before expiration by expending a Bonus Action with the cost of 4 HP and 4 WP for an additional round.