Caveira Birthday Challenge Bygaga 17.10.2019 2019, Caveira, SPAS-15, Weekly Challenges Reward Comments Caveira Birthday Challenge Wish Caveira a Happy Birthday with the Ubisoft Club Challenge. Destroy 20 attacker drones while defending to unlock the Caveira’s Gift weapon skin for the SPAS-15. Caveira’s Gift weapon skin for the SPAS-15 Caveira’s Gift weapon skin for the SPAS-15