Maykrs are demons.
Just a different part of Hell's/Dark Lords' plans that even the Maykrs themselves don't understand.
They are bioengineered by the Dark Lord just like all the other demon soldiers.
Take note of their facial similarities. Also why do they hide their true faces with masks?
Because they look like demons. Which would arouse suspicsion among their loyal Sentinels.
Their memories are bioengineered so they don't know their true origins.
They themselves have an unfounded belief 'religion' based on this alien 'Father'.
Little do they know, their Father, is the Dark Lord.
Just like the demons, the Maykrs share a 'hive mind'.
Demons are constantly fighting each other, until t