Blue ring
To get a blue ring, first get a power glove in the last essence, then go to the gale tree in the zora village in the present, then find a cave there and blast it with a bomb.
Go inside and lift all the mummy cases and you will find a box there, open the box and it will be a blue ring.
The blue ring increases your defense times 2 without lowering your attack power.
More tricks, tips and cheats for this game are right here - The Legend of Zelda: Oracle of Ages cheats
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