Legendary Points are a minor, but valuable currency used to purchase Legendary Upgrades. Once players reach level 1000, they unlock the Legendary system and get 25 Legendary Points. After that, they gain 1 additional point for each level.
You can also gain Legendary Points via Guild Level-up Bonuses. At the current Guild Level Bonus limit of 200, you will receive 158 Legendary Points. Please note if you are below level 1000, you will not have access to the Legendary System and therefore will be unable to use any points you get from your guild.
The final way to gain Legendary Points is through Event Point Milestones.