An Explanation of Tiers, Leaderboards and the Energy System During Ursoth's Assault

[FluffNStuff]

New: It's craftable!
All over Arlor, mobs and bosses will drop a new essence: Energy Essence. Three of these can be crafted over 2 hours into an energy kit that your character (and only that character) can use whenever you need an extra!

They Drop From Event Bosses, Chests and Crates
Energy points will sometimes drop when you defeat an Ursoth's Assault event boss. Plus, they can drop from any of the event chests or the special Elondrian Locked Grand Crate of the Watch.
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Are the energy points that drop in the crate stash able to use on a different character or are the only for that character like the craftable ones from the Energy Essence? I ask because very few players open crates on their mains?