Defender Packs provide a way to get costumes without purchasing premium currency. This allows Free to Play players to customize their characters. The Defender packs are earned through the Onslaught Game mode that released on December 12th 2017. These Defender Packs can be re-rolled with Defender medals for 100-12000 defender medals depending on how many times you reroll them.
When a Defender Pack is opened you can get any cosmetic, skin, tower skin, pet accessories, or pet that is currently obtainable in the game.
The only flairs that can't be obtained are the mastery exclusive flairs, and the onslaught floor exclusive flairs.
There are Currently 3 tiers of defender packs in the game being the Defender Pack, The Epic Pack, and the Mythical Pack.
Defender Pack can have one exclusive item
Epic Pack will have 2 Items, 1 Epic or better quality!
Mythical Pack will have 3 Items, 1 Mythical or better quality!