Small Pure Titan (3 to 4 Meters)

Damage Reduction. All bludgeoning, piercing, slashing, force, and thunder damage is reduced by 5.

Regeneration. A Titan regains 8 hit points on the beginning of its turn. It heals incapacitated limbs in 2 rounds, regenerates severed limbs in 5 rounds, and regenerates a head in 1 minute. Count the rounds at the beginning of the titan's turn. This feature works as long as the Titan isn't dead.

Mindless. Titan automatically fails all dexterity, intelligence, and wisdom saving throws.

Siege Monster. Titan deals double damage to structures.

From Thin Air. Titans are not made of regular flesh. They weigh 10 times less than humanoid creatures their size.

 Immortal. When a Titan drops to or below zero hit points, it does not die. Rather it becomes incapacitated, prone and otherwise looks dead. When a Titan regenerates above 40 hit points, it is no longer incapacitated unless the head is severed and hasn't regenerated yet.

We Reside In The Nape. The Titan may be killed if 10 bludgeoning, slashing, radiant, necrotic, acid, or thunder damage is dealt to its nape before its next turn begins. Creatures may target the nape (Though most won't think to unless they have a degree of knowledge on Titans). The nape has an AC of 17 and can only be hit if the attacker has advantage on an attack roll against the Titan. If the attack roll is above the Titan's AC but below the nape's AC, the damage is dealt normally. When a Titan is killed, its body emits steam and decays in 1d4 minutes.

Solar Powered. If Titan is deprived of sunlight for 2 hours, it is incapacitated until it receives 1 minute of sunlight.

Grab. The Titan attempts to grapple a target within 10 feet. (+4 on athletics check) If it succeeds, the target is brought to the square the Titan is immediately facing. The titan's bite attacks have advantage until grapple ends. This may be done in place of an opportunity attack.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 8 (2d4 + 4) piercing damage.