Being a tad inventive here. Let me know if you want me to reel it back.

[b]Sequelae[/b] is a concept from VtDA, not VtM. Specifically DAV: Guide to the High Clans. The VtM "equivalent" (from the player's guide) in terms of giving Necromancy some flavor is the notion of Authority and Taboo (e.g. that a necromancer either relies on holy symbols or profanity to use necromancy). Sequelae, by contrast, borrows from MtA's concept of [i]Paradox[/i]. Basically, the more a necromancer pushes against the Shroud, the more that the Shroud pushes back to the consequence to the necromancer. An example being plants withering or the necromancer taking on aspects of a corpse (also tying into the Cappodocian curse).

I've always found Sequelae to give great flavor to Giovanni necromancy, or just Vampire necromancy in general, and both more flexible to use in any setting or adaptable to story than the idea that the necromancer would have to fit some binary concept of what a necromancer has to act like.