Sigils appearing on the Tower of Fate’s main door because John goes knocking.
Injustice: Gods Among Us Year 3 (Issue #1)
Zatanna
Justice League: Dark #3
John and Zatanna perform the ritual of Maithuna.
Maithuna is a ritual connected with Tantra (or Tantric Magic), which is basically spiritual practices and magic rituals through sex.
Justice League: Dark #3
John wakes up Zatanna Zatara, using her own Backwards Magic
Ekaw Pu! – “Wake up!”
Justice League: Dark #1
Zatanna Zatara’s magical portal transports John unwillingly.
John Constantine's Spells 