Inspired by another thread, I've been thinking of a highly thematic use for Major Magical Focus, which would cover a very precise or almost surgical use of perdo. Mechanically, I am wondering if Major Magical Focus (Perdo, with only Ind or Part as a target) is viable? Or would that also be too viable?
So this would cover, for example:
Damage spells with targets part/ind
Undoing the fabric form
Invocation of weariness
Invisibility
Destroying the leg of a dining table
It would not cover:
Balls of Abysmal flame (destruction but not through Perdo)
Any sort of damage spells that target several "objects", a structure, boundry, or so on...
Wind of Mundane Silence (room target, so not covered)
Harming several people
Rotting the wood on several incoming arrows/projectiles/etc