Underwater Exploration • Odyssey of the Dragonlords

As the heroes explore the Sunken Kingdom, remember the following rules for underwater exploration:

Fire Resistance. Creatures and objects located underwater have resistance to Fire damage.
Melee Attack Penalties. When making a melee weapon attack, a creature that doesn’t have a swimming speed (either natural or granted by magic) has Disadvantage on the attack roll unless the weapon is a dagger, javelin, shortsword, spear, or trident.
Ranged Attack Penalties. Ranged weapon attacks automatically miss targets beyond the weapon’s normal range. Even against a target within normal range, the attack roll has Disadvantage unless the weapon is a crossbow, a net, or a thrown weapon (javelins, spears, tridents, darts, etc.)

Additional rules for deep underwater exploration are provided in The Chasm section.

Merrow Hag

Large Monstrosity (Merrow), Chaotic Evil AC 14 HP 102 (12d10+36) Speed Str Int Senses Languages Challenge Traits Amphibious. Aura of Fury. the merrow hag, the merrow hag and other merrow have Advantage on attack rolls and Initiative rolls, provided the merrow hag doesn’t have the Incapacitated condition. Actions Multiattack. Bite, Claw, or Harpoon in any combination. Bite. Melee Attack Roll: Piercing damage. Claws. Slashing damage. Harpoon. 20/60 ft. Large or smaller creature, the merrow hag pulls the target up to 15 feet straight toward itself. Bonus Actions Coven Power. hag allies, the merrow hag can use its Coven Power. Constitution Saving Throw: of the merrow hag that she can see. the ability to breathe water until the end of its next turn and gains one level of Exhaustion. Reactions Quarter. Harpoon attack against a target within 60 feet of the merrow hag. Response—Dexterity Saving Throw: hit by the Harpoon attack.

Initiative +1 (11) 10 ft., Swim 40 ft. MOD SAVE MOD SAVE MOD SAVE 22 +6 +6 Dex 12 +1 +1 Con 16 +3 +3 8 –1 –1 Wis 10 +0 +0 Cha 16 +3 +3 Darkvision 60 ft.; Passive Perception 10 Abyssal, Aquan 7 (2,900 XP) ; PB +3) The merrow hag can breathe air and water. While in a 60-foot Emanation originating from The merrow hag makes three attacks, using +9, reach 5 ft. Hit: 10 (1d8 + 6) Melee Attack Roll: +9, reach 5 ft. Hit: 11 (2d4 + 6) Melee or Ranged Attack Roll: +9, reach 5 ft. or range Hit: 13 (2d6 + 6) Piercing damage. If the target is a While within 60 feet of at least two merrow DC 14, one creature within 60 feet Failure: The target loses Trigger: Another merrow makes a successful DC 17, the creature Failure: 28 (8d6) Force damage.