Rizevim has great trust in Euclid as he considers him to be his right hand man.In exchange as a Lucifuge Euclid Is highly loyal to Rizevim as the son of the original Lucifer respectfully call him Rizevim-sama. Euclid's loyalty to Rizevim is so great that Euclid willingly assist Rizevim in fufilling the latter's atrocious ambitions going as far as to adopt Rizevim's ideology that a Devil must be evil as his own claiming that Rizevim's ideas are necessary for him.