Medium to Large beast, unaligned 
      
      Armor Class: 12
      Hit Points: 
      Speed: 
              5 ft
                                , swim: 60 ft
                        
 
      
      
      
                    Skills: Perception +4, Stealth +5
• Keen Smell. The sea serpent has advantage on Wisdom (Perception) checks that rely on smell.
• Water Breathing. The sea serpent can breathe only underwater.
• Hold Breath. While out of water, the sea serpent can hold its breath for 30 minutes.
• Bioluminescence. The sea serpent markings, neck pouch and their tail glow in the dark. 
                                            Senses: Passive Perception 13, Darkvision 50ft, Blindsight 15ft
                          Challenge Rating: 1
        ( 200 XP)
                
                    Proficiency Bonus: +2
           
       
  
                  Actions
    Multiattack. The sea serpent makes two attacks: two times with its bite.
 
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) piercing damage.