Me and my usual AH chums recently got into our first rules argument in quite a while. I'm not expecting anyone to have a definitive answer for this, I'm just interested to see what everything thinks.
The skill "Library Use" says "When you make any Lore check, add +1 to each die you roll for the purposes of checking for successes (i.e., a roll of 3 becomes a 4, etc.)."
The spell "Storm of Spirits" says "Cast and exhaust to gain +3 to Combat checks and to use Lore instead of Fight on your Combat checks until the end of this combat."
So do your dice rolled when using Storm of Spirits benefit from the +1 from Library Use? I think they don't, because you're not making a Lore check - you're making a Combat Check using Lore, whcih is not the same thing.
Here's where it gets really pedantic:
The AH rules do make a slight distinction between "type of skill check" and "what skill you're rolling it with" - but only because of the four special Skill checks. What the rulebook says (on p13 and again on the back cover) is this:
"There are four types of special skill checks that players should be aware of: Evade checks, Horror checks, Combat checks, and Spell checks. Each of these special skill checks are based on one of the six skills listed above and are described later in this rulebook. If an investigator receives a bonus to a skill, any special checks based on that skill also receive this bonus. However, if an investigator receives a bonus only to a special check, that bonus does not apply to any other checks based on the same skill. For example, Evade checks are a special type of Sneak check. A Skill card that gives +1 Sneak is useful both for Sneak and Evade checks. However, an item that gives +2 to Evade checks is only useful when making Evade checks. That bonus cannot be used on a normal Sneak check."
That paragraph mentions bonuses to skills, which is explained as meaning the +1 and +2 stuff which gives you more dice. Adding +1 to dice results for the purposes of checking for successes is NOT the same thing... it's a different game mechanism which isn't mentioned in the Special Skill Check rule.
My friends and I used to think that Grapple was pretty much the game's best Skill (although there are others that are close behind it). The way me and my friends use it, Grapple's bonus applies to Combat checks, so when you're fighting a monster, you get +1 to all your dice. Have I been doing this differently to all you guys? And if not, is it possible that we've all been doing it wrong?