I actually thought that the addition of Resistance rolls to Direct Combat spells for non-living targets was a mistake at first, so I didn't go into it. But reading that passage, it's pretty clear that it was deliberately re-written. So that's another special case you need to cover when handling Direct Combat spells as the damage calculation process differs between living and non-living targets as well as the differences due to Object Resistance.
Given all these changes, I thought it was worth doing some quick calculations. Now this isn't comprehensive by a long means, but it will give us a feel for how things are now. I'll do the equivalent tests for both the old system and the old system but using the new thresholds shortly. If anyone wants to sanity check my numbers, please do so!
Indirect Vs. Direct Combat Spells Post-ErrataI had to use two different types of Indirect Combat spell because the presence or absence of Elemental Effects makes a difference to both the drain and to the target's damage resistance test (Armour if there's an Elemental Effect and Armour x2 if there isn't).
Both drones have a Pilot rating of 3 If you have a very good Pilot rating it makes Direct Combat spells slightly better in comparison to Indirect, but certainly not enough to care about. I haven't covered Counterspelling in this. However, Counterspelling has also changed (thanks to whoever caught that one and pointed it out to me). Counterspelling now applies to a non-living target's Dodge roll rather than its Damage Resistance test.. That's a slight nerf of Indirect Combat Spells in most circumstances.
Anyway, look at the tables above, it seems that under the new system, only very powerful mages can
expect to damage drones with Direct Combat spells. The rest are either spending Edge like there's no tomorrow or hoping for a lot of luck. When they finally are able to affect drones with Direct Combat spells then they become comparable in damage rather suddenly If the target is heavily armoured, then they actually become significantly better. But by this point, we're talking very powerful magicians and the drain is monstrous whether its Direct or Indirect spells.
So when it comes to non-living targets, Direct Combat spells are a bad idea. This certainly resolves any pre-Errata concerns about Indirect Combat spells not being useful. But please keep in mind that this is due to the revised ORs, not the alteration to the Drain mechanic for Direct Spells.
So Indirect Combat spells are far better. But just because Direct spells are bad, doesn't mean Indirect is good. In the examples, a magician with Magic 5 and a casting pool of ten dice casting at Force 5 (safe limit) will probably do a box of damage to a doberman with Clout (no elemental effect) and three boxes with Flamethrower (elemental effect). It's not much and the drain will be two boxes with Clout and
five boxes with Flamethrower! If the magician really goes for it and overcasts at Force 10, then she can deal a lot more damage (six and eight boxes respectively) but the drain's leapt to five and eight. Better hope there's only one Doberman drone.
I'll post some comparisons to how things were in the previous system in a bit.
EDIT: Small error on the Direct Combat spells drain. Now re-uploaded.
EDIT EDIT: Cardul has pointed out that the book contradicts itself and rules out Damage Resistance tests for Direct spells in the "Combat spells" section of the grimoire. I looked at the Calculate Effects part of the new magic rules and saw that they had explicitly changed it so that all Combat spells granted a resistance test. I'm guessing that the section in the Grimoire takes precedence but then if that's so, why did they change another part of the book. Should we add any weight to the fact that the part that allows resistance rolls was changed last indicating an intention to change the way they work?