HHR WIKI
alchemist droplets Increases poison damage by 5%. When below 50% health, increases poison damage by 20%.
bionic earrings Increases base defense by 4%. 18% when you are in a robot area.
butterfly pendant Increases your XP received by 8%, but your defense is reduced by 20%.
clover earrings Increases your XP, coins, and drop rate of items from enemies all by 5%.
crossbones necklace Your attack is increased by 15% against players, but reduced by 5% against enemies.
demon eye pendant If the attack of your opponent is less than 15% of their defense, your attack increases by 30%.
fish earrings Gives you a 20% chance to instantly catch a fish upon attaching to the lure.

flame pendant Increases defense against fire attacks by 15%.
flower earrings Increases critical hit chance by 1%.
gem jewelry Increases defense against any elemental attack by 5%.
kreeton earrings Increases your base attack by 4%. 18% when you are in a wastelands area.
lemon earrings Increases electric damage by 10%.
mushroom earrings Increases poison damage by 10%.
pepper earrings Increases fire damage by 10%.
popsicle earrings Increases ice attack weakening by 10%.
potion danglers Decreases skill cooldown by 4%. Decreases by 15% if below 50% health.
seashell necklace Allows you to jump 1 additional time when in the water.
shrunken zombie hand Increases your attack by 12%. But any attack done to you becomes poisonous.

skull pendant Increases your attack by 15%, but if you die, every item you are carrying (including equips) is dropped.
sock necklace Increases defense against poison attacks by 15%.