Eldritch Tentacles

this spell has a spell level version and a cantrip version

cantrip: you summon a cluster of tentacles growing out of a rune you summon on an inanimate object that remain there until you dispel the rune or go over 120ft. from the rune, you control the texture, shape, and overall appearance of the tentacles, which are about as thick as a muscular arm at most. the tentacles can be cut and severed, but as long as the rune exists you can summon more tentacles if you can see the rune (or are within 15ft. of it) and use a bonus action to do so, you can have up to 6 tentacles. you can command these tentacles with your mind to do a number of things, they have a range of 5 ft, and if the rune is attached to an object that the tentacles can lift, the tentacles can move the object around, giving them a walking speed of 15ft. the tentacles are very flexible, can interact with objects, grapple enemies (+2 to hit, large or bellow), sense things they touch (they can smell and feel things they touch and tell you telepathically), and do anything else your GM decides is reasonable. in combat the tentacles act during your turn, alternatively you can have the tentacles recede into the rune, if you use the tentacles to grapple an enemy from this state they have advantage to hit, assuming the enemy didn't see them recede into the rune.

spell level: you summon a much larger rune (generally on the floor but if an object has a size that allows it, go ahead) with much larger tentacles. the tentacles are about as thick as a tree trunk and behave the same as the small tentacles, except hey have a range of 10 ft., are too large to interact with most objects, can grapple creatures that are huge or below (huge creatures require 2 tentacles to grapple, everything below only requires one), and the rune requires concentration to maintain (with 1 hour duration).  you can have 1 tentacle at level 5, 2 at level 9, 3 at level 15, and 4 at level 19 (player levels). in combat the tentacles act on your turn and can make a multiattack for 3d6 per tentacle. when you summon a tentacle you can give it a number of weapons per tentacle, which decides their attack damage type, as well as a few bonuses, the tentacles can deal, bludgeoning (dealing 4d6 instead) slashing (also 4d6) piercing (dealing half the attack damage to grappled creatures at the start of your turn), and acid (same as piercing), it is up to you to decide how the tentacles appear to deal these damages, and you can have different tentacles deal different damage types.