To find me, you must first find my pairs,
A swarm of creatures, skittering inside walls,
Torturing the old way, sometimes using a chair,
A powerful figure, there until its empire falls,
Or some activities, one might enjoy in their lair.
Who am I?
A connection between all these words is what you seek
Once found, you won't be able to fall to the riddle's trick
It seems the riddle is getting a lot of people stuck
Only four letters are needed, and maybe a sliver of luck
My pairs have the same letters as I do,
Just rearrange them, to find something new!