What is Rhaast meaning?

So i was playing with my new faivorite champion "kayn" and in moments later, i heard kayne asked: "what does rhaast means anyway?" Since in my country, word "Rhaast" (with diffrent spelling ofc) means "truth" i thought it means somthing simular to that But then darkin respond with: OBEY! I got realy confiused when i heard that! Anyone knows where it comes from?or How riot come up with that? Am i a loser and i Should try to get a life? Plz let me know in the comments :)
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