Necrotrooper

Repurposed husks of defeated enemies and fallen comrades alike, Necrotroopers are the primary weapon of the feared Gwelin Yklikya. Whenever a Ter Eira military operation is successful, soldiers often report bodies missing from the medical tents and burn piles. Under the cover of darkness, Yklikya operatives take the most intact corpses they can find and take them back to their closest hidden outpost with the aid of Type 14 Cooler Tanks which prevent degradation. These fallen warriors are imbued with magic and technology and alchemy, primed for their new existence by the "necro-engineers" and brought back to this world by foul magics.
Necrotroopers are semi-intelligent undead and compulsively follow orders to the letter, so long as it is given by one with the appropriate command spell. They are stronger, faster, and more durable than a living soldier. The downside is that they can really only be used for combat, they are not capable of problem solving and only follow their literal orders.