Once a pond a time Crota was big and bad. Guardians feared his presence and dreaded passing the chalice of life. Then hard mode came out and this chalice of life became nothing but a distant memory. Soon guardians just forgot about the normal raid altogether and easy mode wasn't even an option anymore. Hard mode became normal and our standards were raised along with the difficulty. Guardians started looking for there next challenge after conquering this "hard mode" and were left wanting. Wanting for too long. "I'm bored"
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Its because of the raid itself. It forces you to become better. I do like it that way.