Keys are used to open locked treasure chests or rooms. A key can be used when a triangular glowing sign (green, yellow, or black) with a key symbol appears. The player's inventory can hold up to five of each key type, and they cannot be sold or discarded.

Keys

Small

• Starting price (Rebirth 1): 2,500
• Cumulative price increase per rebirth: 500
• Color: Green
• Function: Unlocks chests containing common items, low-value gems, or gold slightly exceeding the key's cost.
• Acquisition: Can be bought, found in chests, won in battles, or occasionally picked up.

Medium

• Starting price (Rebirth 1): 5,000
• Cumulative price increase per rebirth: 1,000
• Color: Yellow
• Function: Unlocks chests with better rewards than small key chests.
• Acquisition: Dropped by stronger enemies; rarely found lying around.

Large

• Starting price (Rebirth 1): 100,000
• Cumulative price increase per rebirth: 5,000
• Color: Black
• Function: Unlocks five specific black chests and a room near the top of the tower, leading to imprisoned Deathless. Rewards include rare items or significant gold.
• Acquisition: Bought in the store or dropped by difficult Titans or Deathless. The first large key is awarded after defeating MX-Goliath.
• Design: Resembles a regular key, with one end forming a circle with seven rays, the eighth being the key itself.

Keys in Infinity Blade III

• Small Key: 40 chips
• Medium Key: 150 chips
• Large Key: 450 chips

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