Swift Tendrils of Cthulon

 You summon ribbons-like & dark-purple, ethereal vines that entrap the targeted creatures.
They appear in a wide circle of round coloured windows around the creatures and quickly pops out to restrain them.
The radius of the ethereal windows' zone is 20 ft/6 m.

 As they are restrained, Necrotic damages will manifest.
2d8 rolls for each following turns, for the remaining of their time, trapped.
The targeted creatures must succeed a Constitution save, to free themselves.


 For every spell slot at a level above 4, a supplementary creature/target can be added.
The radius of the zone gets 3 ft/1 m larger.