I mean they live to serve the dragonborn and they order you to kill parthunaxx "you're not welcome here until he's dead" WHAT? The only reason you exist is to serve me and you make me kill an ally who helped to kill Alduin?
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Only thing I hated about them was their questline was broken. You get virtually nothing even when you do kill parthunax, and in the process you lose out on the greybeards which help you find words of power. The only thing you gained when becoming a blade was a buff that let you do more damage to dragons. Not worth.