You are right about the -15% ELR. Obviously if I went with the shako + occy solution I would have to respec to something else than pure lightning... And I just don't feel like going through a new build again, pure lightning serves me just fine. I think I've done what I can, I've put an ist in tals-orb, p-topaz in tals armor and mask, so that's about it. Maybe I could add some 7% MF sc's instead of lightning skillers. I'd imagine pure lightning being quite weak without any -ELR.
The charms marked with red color are +5 res all sc.
With this build, I have maximized all resists. I land at exactly 400 MF with perfect gheeds, WT and 9x7 MF sc's. I have isted tals orb fore increased MF, as well as putting ptopaz in the armor and helm. I have hit the 105% FCR breakpoint using magefist + p-spirit. I have anni and torch for the maximized resistances, skill points, stats and bonus experience. I have Gheeds for more MF. I have bought both tomes, because my belt slot is for potions. And so I can identify items immediately when I find them, without having to go to town. With all this stuff there is still 4x4 slots left as it can be seen, which gives me plenty of room for MFing.
I have specced as pure light for several reasons, the first and foremost being because of the synergies mixing so well, and lightning/c-lightning killing so fast. For smaller packs of monsters I teleport in the middle and spam Nova, for bosses I use lightning (since it does the most damage) and for spread-out monsters I use chain-lightning to capture them. The source of -ELR comes from the tals set, it gives -15% ELR.
My merc is a Defiance merc, since he boost my defense from 3,5k to around 8k, making the chances of being hit small. I ditched the Holyfreeze merc since he seemed to die and his aura didn't do anything useful, except slowing monsters that were already partly dead.
Please comment or rate and suggest improvements if you find any. Also, my merc is Infinity merc, and I am not too sure about his gear. Right now his got Andy's, eFort AP, and non-etheral Infinity CA.