Sacrificing a unit in Super Fantasy Kingdom is an achievement and one of the requirements to unlock the Lich, a unit you can recruit to fight for you. It's a strong unit worth chasing because of its Fear effect, which causes monsters to run away.
However, you only get the ability to sacrifice units later on in the game, after you've established a prosperous kingdom with a good influx of resources and refinement. That's because you need an Elemental Tower to offer your units to, and you need five Gold Ingots to build it. So, you need enough resources and kingdom space to have a Goldmine and a Smelter, and this can take a few runs to get.
Drag units into the Elemental Tower
The Elemental Tower summons an Elemental. Since Elementals can't level up with food, you must transfer XP from other units to them via sacrifice. To sacrifice a unit in Super Fantasy Kingdom, simply drag and drop any unit into the Elemental Tower. That unit will be consumed, and your Elemental will gain its XP and potentially level up.
You can only sacrifice one unit per day, and four units in total during a single run. After that, your Elemental XP will no longer grow.
Remember that units in Super Fantasy Kingdom are the ones that fight the monsters, so you can't sacrifice workers. To complete this achievement and unlock the Lich, any unit you sacrifice will do it. Your best bet is to sacrifice your weakest unit so that it powers up the Elemental.
You can use the Gold Ingots you'd spend on the Elemental Tower in unit upgrades instead. If you're playing a run to win and not just to unlock the Lich, it's best to evaluate your current units' lineup before sacrificing anyone. Sometimes it's best to upgrade an existing unit rather than sacrifice it.
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