Rat King

Rat King – lore entry (Bestiary) from Diablo III. This creature is the most unsettling of all the natural denizens of Sanctuary. The male of the species carries the eggs which the female deposits on his back. In their larval state, they burrow into the male's back …

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This creature is the most unsettling of all the natural denizens of Sanctuary. The male of the species carries the eggs which the female deposits on his back. In their larval state, they burrow into the male's back, creating visible protrusions. They eat their way out of these protrusions when the host is attacked.