Arrow of the Long Dark

This arrow has been exposed to the nether border between our world and the Shadowfell for many harsh weeks. As a result, it deals force damage instead of piercing as it is not entirely corporeal. When you fire this arrow, you can attack a number of targets in a straight line equal to your proficiency modifier. You ignore up to 1 total foot of cover between each target before it is stopped, but the attack only deals half damage. Each target's AC is treated as 10 for this attack unless it was already lower.