In Infinity Blade 2 for the iPhone and iPad, there is a chamber in the castle known as the weapon chamber or the dead king’s chamber.
There are symbols in this chamber that signify specific weapons. Owning these weapons and bringing them to the chamber will open a door giving you access to powerful items.
Here are the weapons you’ll need, and what items you’ll get by bringing them to the weapon chamber.
Gelder -> Unlocks Nahte (swords): +420 attack, circle, 1 square gem, 1 triangle gem
Halfstar -> Unlocks Aran (helmet): +25 attack, 3 circle gems
Imperial -> Unlocks Kreiger (shield): +38 def, shock defense, light defense, 1 diamond gem
Infinity Blade -> Unlocks Aegis Armor (Armor): +100 health, +5 run, 1 circle gem, 1 hexagon gem
Richochet -> Unlocks Eavet (dual weapons): +75 attack, 1 circle gem, 1 square gem, 1 triangle gem
Thistle -> Unlocks Molnaar (heavy weapon): +160 attack, 1 triangle gem, 1 circle gem
Check out my other guide for a complete list of unlockable items in Infinity Blade 2, and where to get them.