I am writing a story that involves a creature that is specifically not humanoid. Instead of appearing as a human, it is more of ageless energy that exists in the core of a planet, can communicate with the protagonist and other humans of the world, and is able to manifest in various ways, such as a smoky mist or jagged rocks in the landscape. It is closer to a God-like entity if anything, but is still very physical in the world.
I am trying to write interactions with this character and other humans in the story. I think I will ultimately have to use some dialogue, but I want this character to appear completely foreign when it comes to human existence. I am having trouble finding ways to allow this character to exist as a unique being of intelligence and sentience while also limiting the amount of human-like interactions it has with the other characters.
My story uses a fantasy setting, so any sort of magical explanation is at least to be considered. I want to allow this character to feel physical and able to communicate without giving it a voice per se. I've done some research, but I am largely getting information about how to describe voices, which is unhelpful in this scenario.
I appreciate any help on this matter because I am stumped.