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Tentacles belong in the Utility Unknown tier. They are a testing entity.
Spawning
Only summonable via commands.
Unique Behavior
Tentacles are testing entities, used to test new code or concepts that haven't been used before by the mod creator. They are not designed to be seen or used by players.
They have been used to test a scrapped mechanic for the Bioblob where it would've crawled across ceilings.
They have been used to test the moving segments that Hohlfressers use.
They are currently being used to test the procedural animation that Grakensenkers will use.
Behavior
Present a weakness to the cold, like all spore mobs.
Tentacle
Statistics
HP: 20 (x10 hearts)
Armor: 2 (x1 bars)
Damage: 2 (x1 hearts)
ID: spore:tentacle
Threat Level: Variable
Trivia
Tentacles used to be in the Organoid tier when they were first added, but it was changed to have no proper tier (Utility Unknown) when they needed to be tested for procedural movement, since Organoids are incapable of movement.
The Bioblob crawling on ceilings mechanic via Tentacles was scrapped due to the mod creator being unable to get it to work.
Despite being weak to the cold, they take no bonus damage from freezing.
If spawned in water (using something like the Mob Spawner item from the Mob Battle Mod), two Tentacles will be spawned instead of one. The reason for this bug is unknown.
Gallery
A tentacle used for testing moving segments.
A tentacle used for testing procedural animation.
Getting hitboxes to render on a tentacle using procedural animation.
Getting a tentacle to walk using procedural animation.
Ditto.
Up close.