Direct answer: Ranni’s Dark Moon is in Chelona’s Rise, in the south-west of the Moonlight Altar. The tower door is sealed with a message reading “Seek three great wise beasts.” You have to find and attack three spectral turtles, and the order and method of travel are what actually gates this.
The rule that trips everyone up
You must travel between the turtles on foot or horseback. You cannot teleport from one to the next. The turtles only spawn in sequence as you approach the next one legitimately. If you kill the first turtle and then teleport straight to the second, the second turtle will not be there. Once you know this, the tower takes about ten minutes.
The three turtles
- West of the tower. Hanging from the side of a cliff. This is the one you find first, next to the sealed door.
- Far south-east of the Moonlight Altar, sitting at the edge of a cliff. This is the long one — ride it.
- High in the north-west of the Moonlight Altar, south-west of Ringleader’s Evergaol. It is up in the air, so you need the spiringspring in that area to reach it.
The route in order
- Start at Foot of the Four Belfries or from the Academy side, and make Chelona’s Rise your first stop.
- Attack the turtle west of the tower.
- Travel — do not teleport — to the south-east turtle and attack it.
- Travel to the north-west area, take the spiritspring up, and attack the third turtle.
- Return to Chelona’s Rise. The seal is gone and the door opens.
- The Altar South Site of Grace is on the east side of the tower’s front.
What you get
Ranni’s Dark Moon is a legendary Carian sorcery costing 57 FP and 32 stamina per cast across 2 memory slots. On contact it lowers the target’s magic damage negation and inflicts heavy frostbite buildup, which most enemies cannot resist. The dark moon also destroys any sorcery in its path.
Because of that frostbite interaction it can out-damage Rennala’s Full Moon against anything not already frostbitten, while doing less raw damage against targets that are. The practical read: cast it first, then follow with sorcery. Do not spam it — the FP cost is the point of the spell.
Wrong turns worth knowing
- Teleporting between turtles. This is the failure. The second and third turtles do not spawn.
- Attacking a turtle then resetting the area. Start the sequence over from turtle one.
- Looking for the third turtle at ground level. It is in the air. Spiritspring.
- Going to the Academy Gate Town side first. The turtles are a Moonlight Altar sequence; do the tower first.
Evidence status
Research-reviewed. Turtle positions, travel requirements, spell cost and frostbite values are stated from current game data. Not gameplay-verified.