While you wait for The War Within Season 1 to start, how about increasing your mount collection? Besides being a good source for Restored Coffer Key, World Events also have two mounts associated with them that you can collect while grinding for Season 1.
The first mount comes from the Spreading the Light world event. This mount is a rare drop from the reward of the event, Lamplighter Supply Satchel. You are guaranteed nine bags each week, one from the main World Quest and eight from the eight bonus objectives, with an extra chance of getting another eight from the smaller lamplight weekly quests.
Spreading the Light World Event
This event spawns large Lamplights and smaller ones. The large ones require 20x Radiant Remnant from any player to activate, and the smaller ones are individual, requiring 3x Radiant Remnant to activate.
Lighting Major Keyflames light up the area for 20 minutes, granting a bonus objective that can be completed around the Keyflame for a Lamplighter Supply Satchel.
Lighting Lesser Keyflames unlocks a weekly quest in that area that has a chance to grant a Lamplighter Supply Satchel.
The second mount comes from the Awakening the Machine Event. Located in the Ringing Deeps, you can do waves of the Awakening the Machine event every week. For every five waves you complete, you unlock a reward chest. Completing the max number of waves, 20, provides four chests, each with a chance of rewarding this mount.
Awakening the Machine World Event