Jaws Titan

Transformation. A Titan shifter can transform into a Titan, in this case, the Jaws Titan. When the Titan shifter in human (or humanoid) form has a purpose in their heart and damages themselves, he or she shifts into a Titan. The Titan forms out of air and manifests in seconds. The shifters Intelligence, Wisdom, and Charisma scores stay the same (the ones in the stat block are just place holders). Once the Titan shifter wants to revert back to humanoid form, he or she will pop out of the Titan's nape, and the body will slowly melt into steam.

Regeneration. The Jaws Titan recovers 20 hit points at the start of each of its turns. The humanoid inside it also regenerates half of these hit points. If the Jaws Titan takes any form of damage to the nape of its neck, this trait doesn't function at the end the Attack Titan's next turn. The Jaws Titan only dies if the humanoid inside it dies.

Weak Point. The nape of the Jaws Titans neck is a weak point. An attack which specifically targets the Jaws Titan's nape deals damage to the person inside. If the person inside dies, the Titan dies instantly. You must climb up the Jaws Titan to the nape with a Melee attack, or you can try to shoot it with a ranged weapon at disadvantage.

Multi-Attack. The Jaws Titan makes two Claws attacks and can replace one of them with a Bite attack.

Claws. Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 19 (4d6 + 6) slashing damage.

Jaws. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 51 (10d8 + 6) piercing damage. The Jaws Titan's jaws are so strong that they can break through strong materials like adamantite and hardened Titan skin.