Dark Web of The Spider Monarch

5th-level conjuration

Casting Time: 1 action
Range: Self (30-foot cube)
Components: V, S, M (a thread of black silk)
Duration: Concentration, up to 1 hour

A 30-foot cube centered on you, fills with sticky, night-black webbing. The webs are difficult terrain and lightly obscure the area. You are unaffected by the aforementioned effects of the webs and gain a climbing speed of 30 feet when moving on the webs.

If the webs aren’t anchored between two solid masses (such as walls or trees) or layered across a floor, wall, or ceiling, the web collapses on itself, and the spell ends at the start of your next turn. Webs layered over a flat surface have a depth of 5 feet.

Each creature that starts its turn in the webs or that enters the webs during its turn must make a Dexterity saving throw. On a failed save, the creature is restrained for as long as it remains in the webs or until it breaks free.

Each turn that you are in the webs, you can use a bonus action to siphon life force from every creature restrained by the webs. Each creature takes 3d6 necrotic damage, and you regain hit points equal to half the damage dealt.

A creature restrained by the webs can use its action to make a Strength check against your spell save DC. On a successful check, it is no longer restrained.

The webs are not flammable, but are susceptible to radiant damage. Any 5-foot cube of webs exposed to radiant damage dissipates to nothing in 1 round.