Went to fight a legendary dragon to test it out, i died in about 7 seconds. I had full dragonplate armour at legendary. My health is 600 and stamina is 400.
Best patch ever

You reset ALL your skills? Why?

Try to get your Magic Resistance up. That will help against those pesky Dragons.

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Word of advice: Don't legendary the skills you depend on. Only what you don't need and can easily build back up.

I plan on doing:

Smithing
Alchemy
Illusion
Alteration
Speech

I have rings that Fortify the first 4 skills by the millions. Should be a rapid process.