Dark Shard Amulet

Common

Wondrous item, common (requires attunement by a warlock) This amulet of is fashioned from a single shard of twisted purple and teal extraplanar crystal originating from The Far Realm. While you are wearing it, you gain the following benefits: You can use the amulet as a spellcasting focus for your warlock spells. You can try to cast a cantrip that you don’t know. The cantrip must be on the warlock spell list, and you must make a DC 10 Intelligence (Arcana) check. If the check succeeds, you cast the spell. If the check fails, so does the spell and the action used to cast the spell is wasted. In either case, you can’t use this property again until you finish a long rest. This item can be found in Xanathar’s Guide to Everything.

Clockwork Amulet

Common

This copper amulet contains tiny interlocking gears and is powered by magic from Mechanus, a plane of clockwork predictability. A creature that puts an ear to the amulet can hear faint ticking and whirring noises coming from within. When you make an attack roll while wearing the amulet, you can forgo rolling the d20 to get a 10 on the die. Once used, this property can't be used again until the next dawn.