Contents. Sanctuary Onslaught is an endless game mode introduced in Update 22.18 (2018-04-20). The objective is similar to Survival missions, where players must last as long as possible by continuously killing hordes of increasingly difficult enemies, as quickly as possible.

Does doing sanctuary onslaught give standing?

Nope, it does not.

Does sanctuary onslaught give XP?

No experience reward at the end of a "Sanctuary Onslaught"