None of these are actions. I'll assume that just means you want to animate rats.
You take the sack of rats and sit on the floor, laying the corpses out in a row. Birdwise has done a good job; most of the bodies are not obviously corpses, at least in so far that their cause of death is not evident. You discard two of the bodies: the first has no head which is a bit of a give away and the second has been gutted, which is another rather obvious sign that something is off. The rest have been killed in ways only obvious once you pick them up and examine them. You wash any blood off their fur and then consider what the best core for such creatures would be. A nail is an obvious choice but also a clear indication of its status as a puppet. Considering the danger the base presents and their knowledge of necromancy, such an obvious ploy
You consider the usage of these creatures, their intended purpose. They aren't a long term investment, they're disposable spies. And spies tend to have methods of suicide in case they're caught. You think the best would be a core that could be destroyed by the rat itself, to cover your tracks, and which isn't obvious as a core. You search around the room for something that would fit the bill. Nothing immediately springs to mind and you stand there, rubbing your chin in thought an staring into the distance at the wall. And as you stare, you notice something, the roof of the little room is bare wood and some of it a bit splintered with age. You reach up and grab a long, almost toothpick like sliver of wood. You take the wood and embed it in the mouth of a rat, such that its sort of wedged into the gums. You then use it as the core and attempt to anime the corpse.
Everything goes to plan and the rat gets up. You make sure it works as a puppet and then command it to crush the splinter between its teeth. It does so easily and flops down, dead again. You nod to yourself. Everything is coming together. You repeat the process several times, animating corpses with splinters until you have 4 animate rat corpses. You're going to move on to the 5th but you realize you're having a hard time focusing. You feel like you're in a haze, not tired like when you ran out of mana but something else. You can think as clearly as before. It feels, according to the memories, something like being distracted and drunk at the same time.