(Nether Update) The Warped/ Crimson Grub

This mob has 2 variants the Crimson Grub and the Warped Grub. The Warped Grub look like a snail except it has a block of Crimson Mycelium on its back and if a player gets within a 5 block radius of the Crimson Grub it will hide under its Crimson Mycelium apposing as a block. When killed it would drop the Crimson Roots that grow on its back as well as a new item called “paste” I am open for suggestions on what it could be used for. The mob is passive. And the same goes for the Warped Grub except that it is Warped Mycelium instead. I would love to see this mob in the game and thInk that it would fit well in the Nether update!