My version. When I ran Exit 23 I ran it for 1st-level characters, so I wanted him to be powerful, but not overwhelming.
Winter-Demon: CR 3; Large outsider; HD 3d8+9; hp 25; Mas 16; Init +0; Spd 30 ft.; Defense 14, touch 9, flat-footed 14 (-1 size, +5 natural); BAB +3, Grap +11; Atk +6 melee...