Dire bear

A dire bear was a huge version of the typical bear.

Description
Most dire bears were 12 ft (3.7 m) long and weighed as much as 8,000 lb (3.6 tons).

Combat
Dire bears ripped at opponents with their claws and could also bite. When the prey was grabbed, the massive bear would maul the creature with its ursine strength.

Personality
Being omnivorous, dire bears usually did not bother to attack creatures unless they were defending a food source or a personal domain. Dire bears were wild beasts, though, and would feast on human flesh as readily as any other game animal.

Ecology
These bears lived in small groups or preferred to be alone. Many humanoids would train bears to act as guards or pets, such as hill giants and ettins.