While attuned to this skull, you can use it as a magical focus. Spells cast through this focus have a +2 to spell attacks and spell save DC. The skull amplifies your ability to concentrate, but at a great cost, acting as a second mind. However, when you focus your mind, the skull's influence weighs heavily on your soul, causing it to ache with sorrow.
Concentration spells cast with this focus fade away twice as fast, causing the duration of the spell to be half the normal duration. In return, the additional mind the skull provides allows you to concentrate on two spells that were cast with this focus at the same time.
Additionally, when you succeed a concentration check on a spell cast through the skull, you take psychic damage equal to the level of the spell you are concentrating on. This damage treats immunity as resistance. This damage does not require a concentration check.
Notes: Bonus: Spell Save DC, Bonus: Spell Attacks
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