Slaves Shall Serve was created on 2005-10-20.
At the beginning he says Khrevsu tvahyu gradu tore! Khrevsu kvatro midvhu piedhvro! Khrevsu Kristo midhvu vhradro! Medvro vhtrienn utrah vreghgrho! In sumerian. English: Slaves shall serve as the crowns are falling As the apocalypse is nearing Slaves shall serve as the inferior Life force and as undead rivals
None - it is just good layering in the intro of slaves shall serve; I can assure you being vocalist myself - good metal vocalists do not use any distorion except their natural vocal distortion neither does Nergal as he's one of them.
Slaves who were freed but chose to carry on serving their masters had their ears pierced as a sign of loyalty.If the servant plainly says, "I love my master... I will not go out free," Then his master shall... pierce his ear with an awl; And he shall serve him forever.(Exodus 21.5 - 6)
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For the same reasons modern civilizations had slaves. To do work and serve the masters