If you gonna be a bit more strict about it the discount only applies on the summoning test which is resolved with Conjuring + Magic vs. (Force x 2). Not the drain resistance test nor the banishing test or any other conjuring related test for that matter.
But I agree that the drain resistance test can be seen as being part of the act of 'summoning spirits' and that the discount may apply to edge boosts in either of the two tests.
Note that wording around edge discounts are also [still] really weird...
As written Edge
Actions can not cost less than 1, but Edge
Boost can??
Does this mean that 1-Edge
Boosts that normally cost 1 Edge are now free??
(except the "Use an Edge
Action" 1-Edge Boost which explicitly can't cost less than 1)
Does this mean that you can multiply the same 1-Edge
Boost that now cost 0 Edge and still pay zero Edge??
This is probably not the intent, but this is what a strict reading of the rules says ;-/
.....I think perhaps the
intent here might be that either:
- discounts (such as the Thunderbird discount) lower the Edge cost by 1 per Edge Expenditure (rather than Edge Boost as written) and that the cost per Edge Expenditure can not be lower than 1 (rather than Edge Action as written)
or
- discounts lower the Edge cost by 1 per Edge Boost (as written) but the cost per Edge Boost can not be lower than 1 (rather than Edge Action as written)
Rerolling 3 dice (your own failed dice or your opponents successes) in the first case would cost (1*3)-1=2 Edge but would not be discounted at all and still cost (1-0)*3=3 Edge in the second case.
Adding +1 to 2 different dice (normally two multiples of the same 2-Edge boost) in the first case would cost (2*2)-1=3 Edge but only (2-1)*2=2 Edge in the second case.
Rerolling all failed dice (normally a 4-Edge boost) in the first case would cost (4*1)-1=3 Edge and also (4-1)*1=3 Edge in the second case.