it is 1 out of 4 founder's packs,
Founder's Pack
This bundle offers a 35 percent discount off the regular total price of these items!
The Founder's Pack contains an exclusive mount, a pet with a portable bank to carry your items around, a stack of ten strongbox keys, and 1,000 EMP to spend in the in-game TERA Store. This bundle also contains an exclusive “Founder” title.
-info from official ps4 site.