Theo R Cwithin
I cast "Baconstorm!"
It's not exactly what you're asking for (and this is actually for Pathfinder), but I've found the following tables useful for assigning ad hoc target numbers:
The Gneech's "Page 42" for Pathfinder.
His assumptions are noted at bottom, so you can tweak and mod the numbers across the board as you see fit.
The Gneech's "Page 42" for Pathfinder.
His assumptions are noted at bottom, so you can tweak and mod the numbers across the board as you see fit.