Good lord, I just got done with NG+ and saved Licia's invasion for last.
NG+ Ancient Dragon is actually much more easier than NG Ancient Dragon because of that ring which you can use which gives you immunity against fire breaths from behind. It also only drops on NG+ in that foggy place unless you use an Ascetic, which I haven't been to keep each playthrough experience as pure as possible.
Also, I'm sure it's been mentioned before but I don't think there's anything quite as ridiculous for PVE as a Lightning spammer build. AI Enemies aren't as smart as human opponents, they don't dodge them at all and everything just dies in 2 or 3 bolts.
With 51 INT, Dragon Chime +5, and the Clear Bluestone Ring +2 giving 260+ Cast Speed, a basic Lightning Spear does 703 damage per cast to a Lightning neutral enemy. Great Lightning Spear does close to 1k damage per cast. Each slot gives you a minimum of 10 casts, and with 40 ATT + Hexer Hood/Saints Hood you get around 15 casts which makes it the one of the most cost effective spells in the whole game to place in a spell slot when taking damage into account, not counting the Hexes which consume souls.
FROM should really nerf that, Lightning spells are just broken in this game. I was keeping a counter for number of Great Lightning Spears required to take down a boss, and none of them ever exceeded 20 casts. The Ancient Dragon took the most, followed by the Looking Glass Knight, since I think he's resistant to Lightning and Nashandra.
I finally understand what the fuss is all about after going pure melee for my NG run. I think I'll go back to pure melee again for NG++, I feel like I was cheating the whole way during my NG+ run with the Lightning build.