Darkvision allows creatures to see in dim light as if it were bright light and darkness as if it were dim night. This means that in dim light, where a normal creature would be at disadvantage, creatures with darkvision take no penalty to vision.

 You can use your bonus action to roll your body into a ball. While rolling, you can't take any actions, but your speed doubles and you can move through the space of medium and smaller creatures without treating them as difficult terrain. When you move through a creature's space, the creature must make a Dexterity saving throw with a DC of 8 + your proficiency bonus + your Strength modifier or take 2d4 + your Strength modifier bludgeoning damage and be knocked prone.

You have advantage on Perception checks that rely on smell, but disadvantage on Perception checks that rely on sight.