4th-level conjuration
Casting Time: 1 action
Range: 90 feet
Components: VSM, (a full Inkwell, worth 200 gp, spilled as part of the casting).
Duration: Concentration, up to 1 minute
Arcane ink pours from an overturned inkwell, snaking through the air before settling into a series of 8 writhing 5ft cubes. The cubes can be placed in any arrangement, but must be adjacent to one another. The cubes are considered difficult terrain, though creatures with a swim speed are unimpeded. While submerged in a cube, creatures are blinded.
When cast, and at the beginning of the caster's turn, any creatures in contact with one of the cubes must make a constitution saving throw or take 4d4 force damage (save for half).
Whenever a spell or cantrip that deals damage passes through any of the cubes, magical energy conducts across the ink. Any creatures in contact with one of the cubes must make a constitution saving throw or take 1d4 damage per spell level (save for half), dealing the same type of damage as the initiating spell. Cantrips deal 1 damage on a failed save.
As a bonus action, the cubes may be moved up to 15 feet each. They must remain within 90 feet of the caster and must maintain continuity with one another the whole time.
At higher levels: The damage dealt by the spell from all forms deals an extra 1d4 per spell level above 4th.