Necrotic Gold Candlestick

You've infused a candlestick with large amounts of necrotic energies, causing it to burn baleful green flames once lit. The flames appear shield the undead, or beings like you for some reason, within 8 blocks from it, from the sun, though not fire, allowing them to move in daylight without burning.

If both candlestick and undead beings, within 8 blocks of it, are not exposed to the sun, whether they be beneath a ceiling or it's night time, they will slowly heal themselves, so long as it remains lit.

Based on @kiko5836's suggestion