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Gate of Death seemed to be a strange Skill, it was the awakened version of Veronica's Ability to set up graveyards that could let her teleport there or bring Undead there…
However, although she retained such abilities, which she had already made into a Death Magic Spell too, there were newer functions and effects.
Veronica was now able to generate a Gate of Death, a twisting distortion in space of black color that could lead her anywhere there were large concentrations of Death Attribute Mana.
However, she was the only one that could cross this Gate, but for everyone else, they could simply get inside her Divine Realm.
This was most likely a new and particular way of Teleportation, in simple terms, however, it was not fast at all, so it couldn't be used in battle to evade enemy attacks.