The reward of the event mission "Let's make items with cross gates" is amazing. And it's easy. Just put one awakening shoe, one awakening suit, and one awakening weight into the crossgate. With this, first of all 1 pieces are 3 Zeni + items.
10 Premium Gasha Tickets x 5
Premium Gasha Ticket x 20 for 5 pieces.
You can get 10 Zeni and 10 Premium Gasha Tickets.