If you have purchased the battle pass you will be able to unlock a Lara Croft skin. It's a classic style that resembles how Lara Croft looked in the older Tomb Raider games on the Playstation 1.

You will also get a style of the survivor backpack. This differs from the standard survivor pack by giving you the look for a normal brown bag rather than the arrow quiver and rope. This is also a replica of the backpack Lara Croft wears in the original Tomb Raider game from the playstation 1.

Reaching level 15 shouldn't be difficult. If you are regularly doing quests you will reach this in no time. Look out for daily uncommon quests as these are really easy to complete and give you 22,000xp each. There are 3 available each day so you could earn an extra 66,000xp a day.