Merge branch 'WorldArtifactPowerDescriptions' into 'master'

World artifact power descriptions

Updated on use descriptions for several World Artifacts and added some log messages.

Changed Umbraphage's damage calculation to actually care about it's charge level (slight nerf).

Fixed a bug with Butcher that could cause its rampage not to activate on damage.  Now benefits from Charm Mastery.

Stormlash's AOE effect is correctly centered on the target, rather than the user.

DamageType.LITE now reduces the unlit value of grids with darkness if it can't remove them. (Fixes a possible abusable bug with Umbraphage.)

Updated the tooltip for the Invisibility effect.

game/modules/tome/data/damage_types.lua

@@ -909,13 +909,12 @@ newDamageType{
 	projector = function(src, x, y, type, dam, state)
 		state = state or {}
 		useImplicitCrit(src, state)
-		-- Dont lit magically unlit grids
+		-- Counter magical unlite level before lighting grids
 		local g = game.level.map(x, y, Map.TERRAIN+1)
 		if g and g.unlit then
 			if g.unlit <= dam then game.level.map:remove(x, y, Map.TERRAIN+1)
-			else return end
+			else g.unlit = g.unlit - dam return end -- Lite wears down darkness
 		end
-
 		game.level.map.lites(x, y, true)
 	end,
 }

game/modules/tome/data/timed_effects/magical.lua

@@ -264,7 +264,7 @@ newEffect{
 newEffect{
 	name = "INVISIBILITY", image = "effects/invisibility.png",
 	desc = "Invisibility",
-	long_desc = function(self, eff) return ("Improves/gives invisibility (power %d)."):format(eff.power) end,
+	long_desc = function(self, eff) return ("Improves/gives invisibility (power %d), reducing damage dealt by %d%%%s."):format(eff.power, eff.penalty*100, eff.regen and " and preventing healing and life regeneration" or "") end,
 	type = "magical",
 	subtype = { phantasm=true },
 	status = "beneficial",