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Wiki Entry
Crystal Defense
Punch Island survival mode at the back of Sea 2 where you spend 1 Crystal Key to defend a crystal, push through boss waves every 5 rounds, farm Crystal Coins, and chase rare Crystal Damage Relic and Crystal Luck Relic drops.
Systems
Sea 2
Live tracking
Calculator
Plan the grind before you farm
Open Grinding Time Calculator Estimate Crystal Coin farming time from your average Crystal Defense run length and coin payout.Overview
Crystal Defense
- Crystal Defense is a Sea 2 system guide in Sailor Piece.
- Crystal Defense is located at the back of Punch Island in Sea 2.
Section
How to start Crystal Defense
- Travel to the back of Punch Island in Sea 2.
- Bring a
Crystal Key
before you try to start the mode. -
Crystal Key
is currently confirmed as dropping from Sea 2 NPCs, with captured examples from 0.108375% on Delinquent up to 0.18% on Ghoul Members.
- Enter the mode, defend the crystal, and keep pushing through waves for as long as possible.
- Be ready for a random boss to spawn every 5 waves.
Section
Best AFK farm setup right now
- Use Cosmic Being V as the cleanest AFK option for Crystal Defense because the move has no end lag and fires again as soon as cooldown finishes.
- Set up your AFK loop from either the middle of the lane or directly inside the crystal; those are the two most stable positions.
- This is a mode-specific AFK note for Crystal Defense and is mainly about keeping wave clear speed steady while the crystal stays protected.
Section
Currently confirmed Crystal Defense systems
| Feature | Current note |
|---|---|
| Core objective | Protect the crystal from waves of enemies for as long as possible |
| Location | Back of Punch Island |
| Entry item | Crystal Key |
| Crystal Key source | Any Sea 2 NPC; captured examples range from Delinquent 0.108375% up to Ghoul Members 0.18% |
| Boss waves | Random boss every 5 waves |
| Estimated 100% Luck boss-drop checks | Anti Magic sits at about 0.048% to 0.064%, while Demon Wing sits at about 0.060% to 0.080%. |
| Wave 40 100% Luck estimate | Anti Magic about 0.064% and Demon Wing about 0.080%. |
| Drop-rate trend | Later waves still look better for farming, with both Anti Magic and Demon Wing climbing higher on the normalized boss checks deeper into the run. |
| Other confirmed boss-wave rewards | Devil clan, Demonic bloodline, Demon Dweller title |
| Rare relic additions | Crystal Damage Relic (+40% Damage) and Crystal Luck Relic (+30% Luck) can drop as rare Crystal Defense rewards, and Demon Wing chances were buffed. Exact relic drop rates and post-buff Demon Wing rates are not captured yet. |
| Best AFK clear style | Cosmic Being V |
| Best AFK spot | Middle of the lane or directly inside the crystal |
| +1 drop interaction | The 2x Drops gamepass and +1 drop buffs do increase Crystal Coin payouts; Luck does not change Crystal Coin payout rates. |
| Leaderboard | Confirmed and visible beside the mode entrance |
| Shop | Defense Merchant |
| Upgrade shop | Defense Upgrades NPC |
Section
Rare relic drops
| Relic | Bonus | Current source | Current note |
|---|---|---|---|
| Crystal Damage Relic | +40% Damage | Rare Crystal Defense drop | Mode chase drop, similar to Secret Runes from Infinite Tower; exact chance and wave scaling still need capture. |
| Crystal Luck Relic | +30% Luck | Rare Crystal Defense drop | Mode chase drop, similar to Secret Runes from Infinite Tower; exact chance and wave scaling still need capture. |
Section
Crystal Defense key and currency
| Item | Current use | Current note |
|---|---|---|
 Crystal Key | Entry item | Spend 1 Crystal Key to start each Crystal Defense run, with captured Sea 2 NPC rates ranging from 0.108375% on Delinquent up to 0.18% on Ghoul Members. |
 Crystal Coin | Mode currency | Used for Defense Merchant purchases and Defense Upgrades. The rough wave-band payout table comes from a 2x drop Hybrid build using Fortune Chosen spec passive, Devil clan, and Primordial bloodline, so +1 drop layers are baked into those farming-reference values. |
Section
Crystal Defense wave token drops
| Wave range | Minimum | Average | Maximum |
|---|---|---|---|
| Wave 1-40 | 2 | 3-5 | 5 |
| Wave 41-60 | 3 | 3-5 | 7 |
| Wave 61-80 | 3 | 4-7 | 7 |
| Wave 81-100 | 5 | 6-9 | 11 |
| Wave 101-120 | 6 | 7-11 | 15 |
Section
Wave token testing setup
- Current Crystal Defense wave token numbers are from a Hybrid build tested as a damage build with Fortune Chosen spec passive, Devil clan, and Primordial bloodline.
- The posted ranges were recorded with 2x Drops active; the 2x Drops gamepass and +1 drop effects increase
Crystal Coin
payouts, while Luck does not change
Crystal Coin
payout rates. - These values should be treated as the current practical farming reference until a tighter per-wave or no-boost comparison sheet is captured.
Section
Defense Merchant shop
| Item | Cost |
|---|---|
 Anti Magic | 5,000 Crystal Coins |
 Clover Outfit | 850 Crystal Coins |
| Destroyer Aura | 2,000 Crystal Coins |
 Trait Reroll | 4 Crystal Coins |
 Race Reroll | 4 Crystal Coins |
 Clan Reroll | 9 Crystal Coins |
 Bloodline Stone | 14 Crystal Coins |
 Boss Key | 3 Crystal Coins |
 Dungeon Key | 3 Crystal Coins |
 Tower Key | 8 Crystal Coins |
 Common Chest | 1 Crystal Coin |
 Rare Chest | 5 Crystal Coins |
 Epic Chest | 12 Crystal Coins |
 Legendary Chest | 25 Crystal Coins |
 Mythical Chest | 65 Crystal Coins |
 Aura Crate | 1,000 Crystal Coins |
 Secret Chest | 500 Crystal Coins |
 Cosmetic Crate | 1,400 Crystal Coins |
Section
Defense upgrade costs by level
| Upgrade | Gain per level | Level 1 cost | Level 2 cost | Level 3 cost | Level 4 cost | Level 5 cost |
|---|---|---|---|---|---|---|
| Damage | +5% | 850 Crystal Coins | 1,150 Crystal Coins | 1,500 Crystal Coins | 2,000 Crystal Coins | 3,000 Crystal Coins |
| Crit Damage | +3% | 850 Crystal Coins | 1,150 Crystal Coins | 1,500 Crystal Coins | 2,000 Crystal Coins | 3,000 Crystal Coins |
| Crit Chance | +1% | 850 Crystal Coins | 1,150 Crystal Coins | 1,500 Crystal Coins | 2,000 Crystal Coins | 3,000 Crystal Coins |
| HP | +7.5% | 600 Crystal Coins | 750 Crystal Coins | 1,000 Crystal Coins | 1,250 Crystal Coins | 1,750 Crystal Coins |
| Luck | +3% | 1,250 Crystal Coins | 1,750 Crystal Coins | 2,250 Crystal Coins | 3,000 Crystal Coins | 4,250 Crystal Coins |
Section
Defense upgrade notes
- Each upgrade line now has a fully confirmed 5-level ladder from live in-game checks.
- Damage, Crit Damage, and Crit Chance each cost 8,500
Crystal Coins
total to max.
- HP costs 5,350
Crystal Coins
total to max, while Luck costs 12,500
Crystal Coins
total to max.
- Fully maxing all five Crystal Defense permanent upgrades costs 43,350
Crystal Coins
.
- The 2x Drops gamepass and +1 drop effects raise
Crystal Coin
payouts, so Fortune Chosen, Devil clan, and Primordial bloodline are valid coin-farming layers; Luck itself does not increase
Crystal Coin
payout rates.
- The payout table has rough wave-band ranges from Wave 1 through Wave 120, with the minimum moving from 2 on Wave 1-40 up to 6 on Wave 101-120.
Tracker
Crystal Defense progress tracker
Track Crystal Coins on hand, current Defense Upgrade levels, and the exact Crystal Coin wall still left before Crystal Defense is fully maxed.