Phalzevors are giant creatures that wander the cosmos. They are highly intelligent.
However, despite their colossal size, they are actually very frail and delicate, so much to the point where it is impossible to physically interact with the world around them at ease.
To compensate, they possess great powers that guarantee the continuation of their societies, and species as a whole.
There is one catch, however. Their powers rely on the existence of other life.
This is their power: to partially take over the mind of a living being, their host. The more intelligent the host, the better.
The effects that phalzevors have can manipulate their hosts' mental stability and emotions. They can even create hallucinations, affect dreams and instincts.
The influence is most guaranteed to work. The likeliest scenarios go as follows: (a) the host often mistakes the phalzavor's commands as their own thoughts, or (b) gain a sense of an extreme, almost cultish, respect for these god-like creatures.
Throughout the galaxy, groups of phalzevors search for life to use to benefit themselves. It is a key to their survival.
Although the phalzevors' uses for their powers is mostly to benefit their societies and species, sometimes they even search for life to toy with for their entertainment.