Very high level Explosion Expert will not make NPCs instakill

git-svn-id: http://svn.net-core.org/repos/t-engine4@3626 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/data/talents/spells/explosives.lua

@@ -92,7 +92,7 @@ newTalent{
 			for px, ys in pairs(grids) do for py, _ in pairs(ys) do nb = nb + 1 end end
 			nb = theorical_nb - nb
 			if nb > 0 then
-				local mult = (math.log10(nb) / (6 - self:getTalentLevelRaw(self.T_EXPLOSION_EXPERT)))
+				local mult = (math.log10(nb) / math.min(6 - self:getTalentLevelRaw(self.T_EXPLOSION_EXPERT), 5))
 				print("Adjusting explosion damage to account for ", nb, " lost tiles => ", mult * 100)
 				dam = dam + dam * mult
 			end