Does anyone know if the mods are limited to a certain type of sword or axe?  For example, I've seen plenty of -5 FDS I haven't seen them around on many other types of weapons.  I use a -5 chaos axe myself but an upgrade would be nice.
More specifically do +5/-5 fellblades even exist?  Some people ingame say yes but I've yet to actually see them...   I need an HoD equivalent and an energy weapon hiding that looks nice on a monk.
                
            Type of Swords/Axes with +5/-5 Energy Mod?
Guinea Fig
Miikka
                    im not 100% sure but i think the only +5 weapons are the ones which are craftable after last mission.
                
            
fiery
                    Yes +5 and -5 energy weapons exist as drops just got to be lucky. As for end of game theres a crafter for only +5 energy items.
                
            dr1zz one
                    If you are looking for a fellblade that has both +5energy and -5energy at the same time, then no. It will either be the +5 energy mod or the +XX%damage and -5energy mod.
But if you are looking for either +5 energy or -5energy, then yes.
IE:
fellblade R9
+15%damage
-5en
or
fellblade R9
+5en
            But if you are looking for either +5 energy or -5energy, then yes.
IE:
fellblade R9
+15%damage
-5en
or
fellblade R9
+5en

Icelightin
                    i got a +5 ene Wicked Blade with 10/10 furious and +30hp req 11  outside of Brauer doin the Duel quest chest runs afterwards
                
            