Prismatic Crystal Caverns

The Prismatic Crystal Caverns are caverns located below the Asgarnian Ice Dungeon south of Rimmington. The caverns can be accessed at any level, however, reaching the deepest floor requires 100 Dungeoneering and 95 Slayer. These caverns are home to the Slayer Master Verthiel, who will assign tasks only to players with 95 Slayer and 135 Combat. They also house Prismatic Crystal Dragons and their boss variant, the Pristine Crystal Dragon

Floor 1
This floor houses waterfiends, crystalline waterfiends, crystal crabs and mithril dragons. Apart from enemies, you can also fish for rocktails and two new fishes: Crystalline eels and Prismatic fishes, requiring 92 Fishing and 102 fishing (only possible with boosts) respectively.

Floor 2
This floor houses Crystalline waterfiends, Pristine Waterfiends and walruses. However, to get to the different islands around this floor, you are required to activate the different Sunken Crystal-porters. To first one is already activated

To get to Island 2: You need 200 water runes and 2 crystalline spheres (These are dropped by any enemy on this floor or the floor below with a 1/16 chance)

To get to Island 3: You need 9 water talismans and 1 crystalline sphere

To get to Island 4: You need 7 rainbow fishes, 10 rainbow feathers and 3 crystalline spheres

To get to Island 5: You need to cast water wave on it

To get to island 6: You need 8 raw sharks and 8 raw sea turtles

To get to island 7: You need 777 Harmonic dust and 2 crystalline spheres

To get to island 8: You need 2 rocktails and 4 crystalline spheres

To get to island 9: You need 8 swordfish and 3 crystalline spheres

To get to island 10: You need 16 lobsters and 3 crystalline spheres

To get to island 11: You need 10 crystalline spheres

Floor 3
Floor 3 is only partially accesible unless you have 100 Dungeoneering, however you can still talk to Verthiel without the requirement.

Verthiel assigns similar monsters to Laniakea, however, he cannot assign cluster tasks, he is also the only slayer master that can assign Prismatic Crystal dragons and lochness monsters. Killing monsters assigned by him also have a chance depending on the monster's level to drop either a prismatic gem or a shattered elven helmet, both of these are untradeable.

-The gem can be given to him to upgrade the slayer ring to teleport to any of the floors in the caverns, any gems handed over after the first one will instead give 15,000 slayer bonus experience

-The helmet can be given to him to upgrade the slayer helmet to upgrade all slayer helmets to give a 0,5% accuracy and damage bonus, any helmets handed over after the first one will instead give 50 slayer points

You can also give him 30 crystalline spheres to receive either 10 Crystalline eels, 20 crystalline fishes, 80-140 frost dragon bones, 90-150 wyvern bones, 17-48 dragonstones, any crystal seeds (After Plague's End) or 100-500 harmonic dust

Floor 4 and Pristine Crystal Dragon
The final floor of the dungeon can only be accessed with both 100 Dungeoneering and 95 Slayer, and it only contains the pristine crystal dragon.

For the boss fight against the dragon, see it's page here: Pristine Crystal Dragon