Colossal Squig

A Colossal Squig is amongst the largest Cave Squig breeds to ever live, growing to such a monstrous physique that it can rival the size of a small Imperial warship. These legendary creatures have been known to live within the deepest darkest depths of the Vaults and the Grey Mountains of the west. A monster with an insatiable appetite, these massive Squigs are in essence no more than an impossibly vast fleshy maw studded with row upon row of scimitar-bladed teeth.

Prized as the ultimate symbol of power and prestige, only the most powerful of the Night Goblin tribes have been known to lure a Colossal Squig towards the ranks of the enemy. Nearly impossible to direct, let alone train, Night Goblin Shaman must resort to drugged meat (often live and unfortunate Goblin ‘volunteers’) or hugely potent spells to overcome the crude instincts of these behemoths.

Once the monster is drugged or under the influence of an impressive spell, these behemoths can literally wreck havoc upon an entire army alone, tearing through the ranks of the enemy as the creature consumes an impossible amount of flesh and metal with each ravenous bite.

Source

 * Warhammer Armies: Orcs and Goblins (8th Edition) -- pg. 40