Bloated Warhound (Dog)

Relentless Conditioning. The warhound has advantage on saving throws against being frightened or restrained. It has disadvantage on saving throws against being charmed (it does not understand kindness).

Feral Surge (1 per long rest). If reduced to half its hit points or lower, the warhound enters a berserk state for 1 minute:

• Gains resistance to bludgeoning, piercing, and slashing from nonmagical weapons

• Attacks deal an extra 1d4 damage

• Must use movement each turn to approach the nearest enemy

Chainbound. The warhound is tethered to a central pillar by 15 feet of thick chain unless freed. While chained, it cannot move more than 15 ft. from its pillar, but gains +2 AC and deals +2 damage on melee attacks as it fights with blind rage.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target.
Hit: 2d6 + 3 piercing damage. The target must succeed on a DC 12 Strength saving throw or be knocked prone.

Ruptured Lunge (Recharge 5–6).
The hound tears against its own restraints, leaping forward. It makes a single bite attack with advantage. If it hits, the target is grappled (escape DC 13) and dragged 5 feet toward the central pillar.