Bison

https://worldbuilderblog.me/2015/02/24/release-the-mounts/

Bison CR: 1/2 (100 XP)

Large beast, unaligned

Armor Class: 10

Hit Points: 30 (4d10 + 8) 4d10+8

Speed: 40 ft

STR

18 +4

DEX

8 -1

CON

14 +2

INT

2 -4

WIS

10 +0

CHA

6 -2

Skills:
Trampling Charge. If the bison moves at least 20 feet straight toward a creature and then hits it with a hooves attack on the same turn, that target must succeed on a DC 14 Strength saving throw or be knocked prone. If the target is prone, the bison can make another attack with its hooves against it as a bonus action.

Senses: Passive perception 10

Languages: -

Challenge Rating: 1/2 (100 XP)

by theSong

Actions

Hooves. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage.

Ignores difficult terrain; Forrest