As DC's Legends of Tomorrow ramps up for its season finale, the team will need to call on some magical help to deal with the demonic Mallus. Enter Matt Ryan's John Constantine.

The Hellblazer will return to the Waverider in the March 19 episode, "Necromancing the Stone," after Sara Lance touches the powerful Death Totem the Legends acquired this week. With the Totem having the power to raise the dead, Constantine's expertise is definitely required, as this new promo demonstrates.

When Constantine made his Legends of Tomorrow debut in the midseason premiere, he told Ray Palmer that Sara would have to die if it meant keeping Mallus locked away. Sara agreed with the decision, and as this promo shows, it just may come to that. There are six Totems -- Anansi, Fire, Water, Death, Earth and Air -- that are needed to defeat Mallus, who wants to take over Sara when he's released from his time prison. The Legends possess four of them, with the Anansi and Water Totems held by Mallus' minions, Damian and Nora Darhk, and Kuasa Jiwe.

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Airing Mondays at 8 p.m. ET/PT on The CW, Legends of Tomorrow stars Caity Lotz, Brandon Routh, Tala Ashe, Keiynan Lonsdale, Maisie Richardson-Sellers, Dominic Purcell and Nick Zano.