/ignore works wonders against said necro's thoThis spellline is pretty awesome but be prepared to have Necros going nuts as soon as you use it (at least archaic and I think pre-archaic too) because it blocks our own debuffline (Scent).
Other then that it is a spell you'd want to use.
In practice, any druids actually use these spells?
ie - Tarhyl's Burning Disjunction and Enclosure of Tarhyl