You will still have the legendaries that you got from legion and when you start Battle for Azeroth (BFA), the legendaries will be weaker and weaker for each level up.
The level cap in BFA is 120 and when you are around 118, then your legendaries are more or less totally worthless.
BUT the secondary stats are still good, so keep the legendaries until you get better secondary stats.
- Get 385-425 ilvl gear in Nazjatar - Benthic Armor
- Full Mechagon Guide
- Patch 8.2 releases June 25!
- Boss Tactics Guide: Radiance of Azshara
- Boss Tactics Guide: Za´qul
- Raid Boss Guides/Tactics: Blackwater Behemoth
- Boss Tactics Guide: The Queen´s Court
- Boss Tactics Guide: Lady Ashvane
- Boss Tactics Guide: Abyssal Commander Sivara
- Raid Boss Guides/Tactics: The Eternal Palace