Kobold, Leviathan Hunter 2014
CR 10 humanoid
Medium humanoid, chaotic neutral
Can grapple creatures that are two sizes larger than itself and can move at its full speed when dragging a creature it has grappled. If hunter grapples a Med or smaller creature target has disadvantage on its escape attempts. Hunter has advantage on ability checks and saves made to escape a grapple or end the restrained condition.
While hunter is wearing no armor and wielding no shield its AC includes its Con modifier.
Can hold its breath for 30 min.
Advantage on Wis (Perception) and Wis (Survival) checks to find and track Large or larger creatures with swimming speed.
Its weapon attacks are magical. When it hits with any weapon weapon deals an extra 2d8 cold or poison (included below) hunter’s choice.
Advantage on attacks vs. creature if 1+ unincapacitated attacker ally is within 5 ft. of target.
In sunlight disadvantage on attacks and Wis (Perception) checks that use sight.
Bonus Actions
Pulls on the cord connected to its harpoon returning harpoon to its empty hand. If harpoon is stuck in a creature that creature must make DC 17 Str save or be pulled up to 20' toward the hunter.
Reactions
If it is target of an attack it can see while grappling a creature it can hold the grappled creature in the way and the grappled creature becomes attack's target instead.
Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details