Giant Lizard

A giant lizard can be ridden or used as a draft animal. Lizardfolk also keep them as pets, and subterranean giant lizards are used as mounts and pack animals by drow, duergar, and others.

Traits
Variant: Hold Breath : The lizard can hold its breath for 15 minutes. (A lizard that has this trait also has a swimming speed of 30 feet.)

Variant: Spider Climb : The lizard can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check

Actions
Bite : Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) piercing damage.