In the swamp of turtles of unusual size (Harry Quinn, back cover of AD&D module N1: Against the Cult of the Reptile God, TSR, 1982)

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In the swamp of turtles of unusual size (Harry Quinn, back cover of AD&D module N1: Against the Cult of the Reptile God, TSR, 1982)
Panicked Fjord is the best.
Giant snapping turtle, just one of the hazards on the slavers’ island of Suderham (AD&D module A4: In the Dungeons of the Slave Lords, 1981; possibly by David Sutherland)
DND Monsters: Giant Snapping Turtle
From: Tomb of Annihilation
Large Beast, Unaligned
AC 17 (natural armor), 12 while prone
HP 75 (10d10 + 20)
Speed 30 ft., Swim 40 ft.
Str 19 +4 Dex 10 +0 Con 14 +2 Int 2 -4 Wis 12 +1 Cha 5 -3
Senses Darkvision 60 ft.
CR 3
Traits
Amphibious. The turtle can breathe air and water.
Stable. Whenever an effect knocks the turtle Prone, it can make a DC 10 Constitution saving throw to avoid being knocked Prone. A Prone turtle is upside down. To stand up, it must succeed on a DC 10 Dexterity check on its turn and then use all its movement for that turn.
Actions
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 18 (4d6 + 4) slashing damage.
I’ve always loved fantasy stories with nations built in the corpses of giant animals, but I didn’t realise we had one here on Earth! I have to add Kiribati to my dream holiday list.