While Heizen was paying close attention to the fight between Luna and Nythera, he suddenly heard a loud rustling sound, followed by a soft "plop."
He looked in the direction of the sound, only to see one of the warriors being dismembered by the spiders as they killed his summon.
'Sigh, it seems the shadow slaves aren't invulnerable. However, it does make sense as they are also soul bodies in a way.'
If Heizen wanted to, he could use the 'Shadow Domain' to envelop the shadow and save him. However, he chose not to, as it wasn't necessary, and he didn't want to use the power of Authority recklessly.
Moreover, except for Balor, all three shadows were too weak for him, and he didn't want to maintain them indefinitely. Getting killed in battle was a better outcome than letting them linger without purpose.
'Boom!' A raging fire engulfed the group of spiders that had attacked the shadow, burning them to a crisp.