There is a total of three Relics that use the Necklace slot, you can only use one of these at a time.
Location: Nether Chests
Abilities
List of all the abilities of the Reflecting Necklace
Infernal Hatred
The Rflecting Necklace accumulates all the damage received by the wearer, after 5 seconds or in case of a buffer overglow the relic explodes, trowing obsidian fragments in all directions harming and stunning enemies
Horde of zombies?
Location: Underwater Chest
Abilities
List of all the abilities of the Jellyfish Necklace
Power Over the Sea
The Jellyfish Necklace will not allow its user to sink in water
Just show it
Electrical Discharge
Deals damage to targets when colliding with them.
hit a guardin at a temple or a drowned
Paralysis
When Electrical Discharge is triggered, imposes a paralysis effect on the target
mutant zombie
Location: Pyramids Chest
Abilities
List of all the abilities of the Holy Locket
Belief (Sanctify Mode)
Directs a portion of your healing as damage to nearby targets and reduces incoming damage by 1% per amount of charges.
remember allyes
Belief (Unholiness)
Absorbs a portion of the healing of nearby targets and icreases damage dealt by 1% per amount of charges.
Repentance
Burns the health of nearby undead.
try a different brand of zombie
Blessing
Grants temporary invincibility upon activation, consuming charges from the relic internal buffer each second.