I've just finished the quest of the 8 Dragon Priest mask and got Konahrik.

But when I want to upgrade it at the forge, I can only go to Perfect. Can't it go to Legendary ?

I'm 100 in forge.

2 Answers

The table shows what quality improvement an item will achieve based on smithing level and if the smithing perk for the item is taken or not. You can continue to improve on items once they reach Legendary, but the description will not change.

Quality Skill Required Effect Without Perk With Perk Armor Other
Fine 14 14 +2 +1
Superior 31 22 +6 +3
Exquisite 65 40 +10 +5
Flawless 100 57 +13 +7
Epic 134 74 +17 +8
Legendary 168 91 +20 +10

Source

Smithing skills higher than 100 can be attained using "Fortify Smithing" equipment and potions, thus allowing any item to be made Epic or Legendary.

Source

4

konahrik the final dragon priest mask is able that i know of so far to be upgraded to 82-85(can't fully remember)armor points and when low on health will have a chance of healing you,summoning a dragon priest that is bound to you,raising the dead around you to fight for you and pushing back enemies