An electromagnetic ray fired from the my organism mouth, the EM Beam is incredibly deadly to those on the receiving end as the beam’s magnetism is up to 1 quadrillion gauss and strong enough to disrupt covalent bonds of molecules. Powerful to dissolve the molecular structure of any matter. What process take place in this process of creating this beam ?
It seems that, in order to protect itself, your creature would have to cover the surface area of its skin (as well as surface area of the interior of its mouth and of the interiors of all the other components of its digestive and respiratory systems) with portals that were capable of teleporting the extinction-event-level quantity of magnetic fields into deep space, or another dimension, or some other location of a similar distance. If you want, you could even say that these types of portals only teleport magnetic fields and don't register on the visible light spectrum, making it so that your creature simply appears to be immune to the effects of his blast that could wipe out all other physical life on a planet.