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Bosses and Special Mountains

Special mountains are progression checks. Some are timed damage checks, some are artifact gates, and the final spire checks a required artifact set.

Special Mountain Path

Mountain	Level / Trigger	Check	Reward / Result
Triple Seal Gate	Level 50 key gate	Level 50 three-key gate before the late-game spire path; tied to Ruby Key, Sapphire Key, and Emerald Key progression.	The Nauglamir after keeping Ruby Key, Sapphire Key, and Emerald Key.
Goblin King Peak	Level 20 timed boss, 180 seconds	Level 20 timed Goblin King milestone with a 180-second timer; success awards the Goblin Crown artifact.	Goblin Crown.
Dragon's Peak	Level 40 timed boss, 180 seconds	Level 40 timed dragon boss with a 180-second timer; success awards Dragon's Egg and dragon riches, while failure forces a prestige or retry.	Dragon's Egg.
Architect's Summit	Level 60 timed boss, 180 seconds	Level 60 timed Architect's Golem boss with a 180-second timer; the game warns you to destroy the mountain before the golem seals itself away.	Mountain Core.
Balrogg's Pit	Level 80 timed boss, 180 seconds	Level 80 timed Balrogg boss with a 180-second timer; failure forces a prestige or retry and success awards the Shadowflame Whip.	Shadowflame Whip.
The Great World Spire	Level 100 artifact gate	Level 100 final artifact gate and spire target; requires eight special artifacts before the forcefield opens and endless mode begins.	Endless Mode after the eight required spire artifacts are present.

How To Prepare

Problem	Preparation
The timer expires.	Prestige earlier, then return with a focused damage branch and burst tools instead of a wide economy build.
Damage looks high but the check still fails.	Watch the timed mountain's health bar. If dens, walls, or loose hazards are eating most attacks, add direct mountain burst or temporarily stop chasing side targets.
Boss-wall visuals are confusing.	Treat walls and boss decorations as part of the special mountain scene, not as normal dens.
The gate asks for artifacts.	Stop pushing normal mountain levels and finish the artifact checklist first.
You are dying to hazards during the push.	Buy runner dodge, shields, anti-rock tools, and enough hauling support so ore does not pile up while you race the timer.

Useful Builds For Timed Checks

Build Direction	Use
Demolition early	Use Demodwarves with Efficient Delivery, Tightly Packed Package, and Lightweight Casing for early timed burst.
Artillery burst	Use Great Duke Cannon with Rapid Cannonade, Devastating Payload, Ground Nuke, or Air Strike once the mithril/gold cost is affordable.
Focused fire or projectile line	For fire, build Flamers with Rapid Ignition, Searing Wounds, The Great Pyre, and Infernal Symphony. For projectiles, use Harpoon Ballista with Lubed Crank, Monster Bane, Multi-shot, and Flaming Bolt.
Mithril and artifact support	Helps if the check is blocked by missing rare currency or required artifacts rather than raw damage.

If You Fail

Failed Check	Return With
Goblin King Peak	Return with a focused early burst branch: Demodwarves with cooldown/damage support, or a funded fire/projectile line. Do not spread gold across every building.
Triple Seal Gate	Return with Ruby Key, Sapphire Key, and Emerald Key kept. More damage does not solve a missing-key gate.
Dragon's Peak	Return with better timed damage and enough hauling that reward drops do not clog the run after the clear.
Architect's Summit	Return with direct mountain burst and enough den/hazard control that side targets do not absorb the whole timer.
Balrogg's Pit	Return with a late damage package and Forge/Spelunker economy already running so the reward path can be used.
The Great World Spire	Return with the full Great World Spire checklist; this is an artifact gate before it is a damage check.