How do you get the Harrowing 2013 - Tomb Angel?
It was a mission or event reward. Riot's description in the client reads: “Earned by playing one game of Summoner's Rift with any ward skin equipped.”
Is the Harrowing 2013 - Tomb Angel still available?
No. Riot tied the Harrowing 2013 - Tomb Angel to 2013 (mission reward), and it does not normally bring back past event rewards or bundles.
