Adaption. SCP-682 can adapt to anything after getting hit by an attack. As a reaction after getting hit by a damage type SCP-682 can adapt gaining resistance for 1d4 rounds after which it gains immunity for up to 1 week. It can have up to three different immunities at a time besides poison. If SCP-682 tries to get a fourth immunity the oldest immunity goes away. SCP-682 can spend 1 immunity to escape magical confinement.
  Keen Senses. SCP-682 has advantage on Wisdom (Perception) checks that rely on sight, hearing, or smell.
  Regeneration. SCP-682 regains 15 hit points at the start of its turn if it has at least 1 hit point.
  Magic Resistance. SCP-682 has advantage on saving throws against spells and other magical effects.
  Amphibious. SCP-682 can breathe any gas or liquid.
  Magic Weapons. SCP-682 weapon attacks are treated as magical to overcome Immunities and Resistances.
  Old god's heart. If it reaches 0 hp, the big reptile returns to life in 3d6 3d6 hours and regains all its hit points. This does not occur if the reptile's heart is removed. a wish spell will have no effect.