It is time inefficient to have full END. You will take less damage in the long run, but you simply won't do enough damage.
Honestly, it's really not that slow. I am a patient man and full end is quick enough for me.
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"Do or do not, there is no try." - Yoda "Put off today what you can do tomorrow." - Anon "The secret to creativity is knowing how to hide your sources." - Einstein "Life is a long lesson in humility." - James M. Barrie