I looked at the Wiki page for Spell Power recently, and had a good laugh. It still mentions stacking between Eminence of the Sun I & Flame Manipulation I.
I want to do some testing, so I figured it would be a good idea to check here first. No sense in doubling up our work.
I want to make a chart of Spell Power sources, how they stack, and what they boost (since MP & RP basically made it into a guessing game). We all know how much of a crap shoot it is whether the descriptions are accurate.
Sources: Action Boost, Alchemical, Artifact, Destiny, Feats (Empower, Empower Healing, Maximize, Various Epic & Past Life), Guild (Ship buffs), Enhancements (Class & Racial Trees), Equipment, Implement, Insight, Music, Mythic, Profane, Psionic, (Various Set Bonuses: Quality), Skills.
Modify damage, but don't boost spell power: Environment (Into The Deep), Healing amp, Helpless, Race (Robot healing penalty), Melee Power, Ranged Power, Spell Crit. chance, Spell crit damage.
Did I miss any?
Other questions that had answers in the past, but now need to be re-checked:
Does anything outside of a few select enhancement trees affect poison damage?
Impulse used to boost untyped, including bludgeon, piercing, and slashing. Tool tips appear to have been updated to include these. Is it accurate? What other kinds of unlisted damage does impulse still boost?
Does Radiance still boost alignment damage? Tooltips have been updated to include alignment.
Which other spells or enhancements have weird exceptions, like Consecrate?
Probably bigger than I can chew:
Charting which enhancements are boosted by spell power, and which ones are boosted by MP/RP, and which ones refuse all boosting. I suck at Excel. However, an excel sheet that calculates SP (taking into account stacking & non-stacking sources), would be fucking awesome. Something to show the theoretical max., and thereby know how far off the actual is.
(If I find something that gets boosted by both MP/RP and SP ... I'm keeping that shit to myself. You probably should, too.)Doing the same for destiny powers.
Damage procs from equipment: Is there any logic to it at all? Or are none of them supposed to be boosted, but the devs just couldn't be bothered to check that they aren't? (Greensteel procs, ruby augments, clickies, etc.)
Honestly, I think this is more than I can do. But the rule is still "He who sees the problem has to fix it," right?
Edited: Modified per suggestions.
Edited: Added Profane, Music, ToEE "Quality" Set bonus