Credit: Luciferian Apotheca

This silver pendant glows with an arcane energy; the ruby set by the chain gives off a feeling of hunger.

While attuned to this pendant, the effects of your spells are improved. You deal an additional amount of psychic damage equal to your total caster level * the spell slot level used, provided the spell does damage. Otherwise, the spell's duration is extended by a relative amount equal to your caster level * the spell slot level used (rounds, minutes, hours, days).

The pendant has a number of charges equal to your total caster level. Whenever you cast a spell, you can spend a number of charges equal to the spell slot level used to activate the extra effects. If you do not have enough charges, the spell is cast as normal.

Curse. This pendant is cursed, and becoming attuned to it extends the curse to you. As long as you remain cursed, you are unwilling to part with the pendant. You may only cast spells using this pendant as an arcane focus / holy symbol. Attempting to use a different focus forces you to make a d20 roll. On a roll greater than or equal to your caster level, the spell is cast normally. Otherwise, you take an amount of psychic damage equal to your caster level * the spell slot level used. You may only cast spells, provided there are charges remaining in the pendant.