Armor Class 18 (natural armor)
Hit Points 195 (17d12 + 85)
Speed 60 ft.
Saving Throws Str +12, Dex +5, Int +6, Wis +5, Cha +6
Skills Acrobatics +5, Athletics +12, Insight +5, Perception +5
Damage Immunities lightning
Condition Immunities paralyzed, prone
Senses darkvision 60 ft., passive Perception 15
Languages Common, Draconic, Primordial
Challenge 12 (8,400 XP)
Limited Amphibiousness. The dragon eel can breathe air and water, but it needs to be submerged at least once every 6 hours to avoid suffocating.
Shocking Hide. A creature that touches the dragon eel or hits it with a melee attack while within 5 feet of it takes 5 (1d10) lightning damage.
Storm Glide. During storms with ample rain or lightning, the dragon eel gains a flying speed equal to its swimming speed.
Multiattack. The dragon eel makes one Bite attack and one Tail Slap attack.
Bite. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 26 (4d8 + 8) piercing damage plus 5 (1d10) lightning damage, and the target must succeed on a DC 18 Constitution saving throw or become paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Tail Slap. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 30 (5d8 + 8) bludgeoning damage plus 5 (1d10) lightning damage, and the target must succeed on a DC 18 Strength saving throw or be pushed up to 10 feet away from the eel. The dragon eel can choose to not push a target.
Lightning Breath (Recharge 6). The dragon eel exhales lightning in a 60-foot line that is 5 feet wide. Each target in that line must make a DC 18 Dexterity saving throw, taking 55 (10d10) lightning damage on a failed save, or half as much damage on a successful one.