Crystalline Caverns (campaign)

The Crystalline Caverns campaign map is the second entry in the campaign dropdown — a 50-wave track tuned around the T3 crystal-tech towers. Expect the right panel to stay crowded; plan your caverns-dimension runs between waves to stockpile resources.

See the Crystalline Caverns biome page for the left-panel melee-combat side of this expansion.

Overview

Property	Value
Total waves	50
Difficulty	Extreme
Background	Crystal biome
Road texture	Crystal
Victory drop	15 % chance: 1 × void_touched_shard

Structure

• Waves 1–14: Ramp-up paced like Desolate Depths but with crystal- themed swaps where appropriate. Survivable with T1/T2 towers.
• Waves 15–30: Mid-game. Introduces heavier enemy mixes and tests whether your production chain can keep up.
• Waves 31–39: Hand-crafted pressure phase. Dense prism packs, splitter flocks, and stealth phantoms that punish under-specced detection. T3 towers start paying for themselves here.
• Wave 35 miniboss: Crystal Titan — 450 HP, armor 20, shield aura on nearby enemies, spawns orbs at 50 % HP.
• Waves 40–49: Template-scaled waves driven by shared/wave-generator.ts. Templates rotate: swarm flood → heavy brawl → ability gauntlet → prism barrage. Deterministic mulberry32 seed keeps MP runs in sync.
• Wave 50 boss: Prism Warden — 1800 HP, armor 35, reflects 50 % of light damage, summons orb minions at 75 / 50 / 25 % HP.

For per-wave composition see Waves.

Required T3 towers

The waves are balanced around at least one of the three new T3 towers being online by wave 35:

• Refraction Lens — chain splitter for crowds.
• Crystal Tuner — heavy AoE + stun; the crystal eruption anchors your defense line. 2.2 s fire rate, 96 px AoE radius, 800 ms stun.
• Prismatic Beam — long-range chain damage that falls off gently across 3 hops.

All three unlock at the arcane_towers tech node and consume caverns resources you'll collect from the biome dimension.

Victory drops

Completing wave 50 rolls a 15 % chance per player for 1 × void_touched_shard. Shards feed the Void Sword recipe at the account-level Equipment panel.

This is the only rare drop from the caverns campaign — other caverns resources (lumencore, resonant_dust, prism_shard, etc.) come from the biome nodes, not from clearing waves.

Strategy

• Don't try the Caverns campaign until you've cleared Desolate Depths at least once — the mithril_lump earned there unlocks the Mithril Sword which you'll want for biome combat.
• The Prism Warden reflects light damage (crystal_beam, prismatic_beam). Bring a mix — don't wall it with Prismatic Beams alone.
• Place a Crystalline Gateway early in the Cave. Stocking caverns resources between waves is the only way to afford the T3 towers needed for the later phase.
• In co-op: coordinate who farms the Caverns biome and who sits on the TD panel. Server-authoritative mob/drop state keeps everyone in sync.