Answer

You can not get Viking Legacy or Thunder Legacy from Containers, they were given to the top 10 participants of the 3 factions during the War: Domination. There is no idea as of yet on how to get them.

Answer
Hi,
Skin such as Legacy can only be obtained in some specific Circumstances: Wars, Opening containers, winning in a contest such as V-Log ones, besides that skin can be a reward for an eSports tournaments, or can be also obtained in a specific challenge dedicated for the skin. And finally you can buy them during the Black Friday if developers have added them in the shop list
Customer support service by UserEcho
Hi,
Skin such as Legacy can only be obtained in some specific Circumstances: Wars, Opening containers, winning in a contest such as V-Log ones, besides that skin can be a reward for an eSports tournaments, or can be also obtained in a specific challenge dedicated for the skin. And finally you can buy them during the Black Friday if developers have added them in the shop list