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.
- Patch 10.2.6 Launches on March 19th
- Play Hearthstone in World of Warcraft - Hearthstone 10th Anniversary
- Guide: How to Get the TOY: Hearthstone Game Table
- Guide: Rewards from Hearthstone Minions Event
- Guide: How to Complete the Achievement - “Card Collection”
- Full Guide: Hearthstone Anniversary Event in WoW
- This Weekly Bonus Event (Feb 21): Mists of Pandaria Timewalking
- INCREASED Chance to get Legendary Weapon - Embers of Fyr'alath
- 10.2.6 PIRATES in BOOTY BAY
- Everything Coming in the Hearthstone Event in World of Warcraft