A giant rhinoceros beetle infected by the spores of the infectious mind
A giant rhinoceros beetle is one of the largest beings susceptible to the spores of the infectious mind.
An Infected Giant Rhinoceros Beetle can still charge for a +2 attack bonus, but it is too sluggish to attack twice per round. As the parasites do not affect its visual acuity, it can still see in all directions and suffers no penalty to Armor Class when attacked from behind.
Gems are often found in their abdomen.
Basic Fantasy Field Guide Omnibus