The Forge’s rarest prize, Prismatic Heart, pulses just beyond reach in Roblox’s crafting fires.
How to Obtain The Forge Prismatic Heart
Defeat the Prismarine Spider in the Spider Cave on Island 3, Frostspire Expanse, for a rare drop chance around 1 in 33,000. Access requires sufficient weapons and armor to handle the fight. Players use Prismatic Hearts mainly for quests or future crafting.
The Prismatic Heart is an enemy drop that can be obtained by killing spiders inside the Spider Cave of the Island 3 (Frostspire Expanse). You can find three types of spiders in the Spider Cave: Crystal Spider, Diamond Spider, and Prismarine Spider. All of them drop the Prismatic Heart, but the chances increase with the difficulty of the enemy. For example, the Crystal Spider has the least chance, and the Prismarine Spider has the highest chance of dropping the Prismatic Heart.
We recommend farming the Prismarine Spider. Fighting it can get rough if you are using any normal armor and weapons. We suggest you follow the best weapon recipes and armor recipes to create a strong loadout.
The Forge Prismatic Heart Uses
The Forge Prismatic Heart Uses a crafted blend of rare ores and refined catalysts to channel elemental energies, enabling powerful upgrades and unique abilities for your gear.
There are multiple uses of the Prismatic Heart in The Forge. The main use of it is to complete the cult questline, which also requires the Golem Heart and the Yeti Heart. You can get the specific quest from the Auron NPC in the Raven Cave. Completing the questline finally unlocks the Dragonhead Pickaxe. Other than that, the ore comes with a 5.5x multiplier, which makes it a good option for forging weapons and armor. The ore also carries the passive traits that give 20% Crit Chance, 5% Crit DMG, and 15% Chance to Slow enemies for 2 seconds (18 sec cooldown) on weapons.
Where is the Spider Cave in The Forge
Spider Cave lies on Frostspire Island (also called Frostspire Expanse) in The Forge on Roblox, past Greedy Cey’s stall from the starting area and up the path near Sensei Moro.
Directions
From spawn, head past Greedy Cey’s stall and follow the upward path toward the cave entrance. Inside, use the compass at the top of your screen to head directly east to the back, then turn south to reach the open area with the Prismarine Spider.
Key Features
The cave hosts Crystal Spiders early on, Diamond Spiders deeper in, and the Prismarine Spider boss at the end for Prismatic Heart drops. It’s tied to the Raven Cult questline from NPC Auron, making it efficient for farming during those steps.
Show a map route from the Forge start to the Spider Cave
Spider Cave sits on Frostspire Island in The Forge on Roblox, accessible from the starting spawn area.
Step-by-Step Route
From the main spawn near Greedy Cey’s stall, head right past the stall and follow the uphill path toward Frostspire Expanse. Continue straight until you spot the cave entrance marked by a sign; take a right just before entering to skirt around if needed, then proceed inside.
Inside Navigation
Once in Spider Cave, follow your compass east to the back of the cave. Turn south at the open area to reach the Prismarine Spider boss zone. Full maps of Frostspire show it as the primary cave on Island 3’s southern edge.

