With this arm attached and attuned, you can use your reaction to absorb a spell that is targeting only you and not with an area of effect. The dark metal arm is inscribed with runes like tattoos that *can* glow blue when the wielder uses magic.
The absorbed spell's effect is canceled, and the spell's energy -- not the spell itself -- is stored in the rod. The energy has the same level as the spell when it was cast. The rod can absorb and store up to 18 levels of energy over the course of its existence. Once the rod absorbs 18 levels of energy, it can't absorb more. If you are targeted by a spell that the rod can't store, the rod has no effect on that spell.
When you become attuned to the arm, you know how many levels of energy the rod has absorbed over the course of its existence, and how many levels of spell energy it currently has stored.
The spear can be deployed to do touch spells at a range of 10 feet.
If you are a spellcaster connected to the arm, you can convert energy stored in it into spell slots to cast spells you have prepared or know. You can create spell slots only of a level equal to or lower than your own spell slots, up to a maximum of 5th level. You use the stored levels in place of your slots, but otherwise cast the spell as normal. For example, you can use 3 levels stored in the rod as a 3rd-level spell slot.
Notes: Attunement Item, Utility, Warding
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