PoE Increased Critical Strikes, Hardcore, Nova builds

Leveling Tips Act 1 - 5 Rush Elemental Overload on skill tree, if needed pick up Health Mana nodes on right side of witch starter area, i go for life on top right first then branch left to templar area. Buy Minion damage / Infernal Legion support in Act1. Socket in Summon Skitterbots in Act 2. Also optional to level Spiritual Aid during leveling to boost both your and skitter DPS then respec out of it later. On lvl 28 equip 4L Vortex + Deadly Ailments + Cold to Fire + Ignite Prolif

I elaborate a CoC Icenova around 1 or 2 ex max (cheap 6 link) can someone help checking the PoB that understant about CoC builds, I think theres a looooot of room for late game. This build is designed to rush red maps, delve, contracts and not hardcore stuff. POB:

Important notes Mana regen % anywhere you can get it from is really really good - start with clarity and replace it with herald of thunder once you get enough mana regen Gloves w/ spell damage leeched as ES are a huge survivability boost. Surgeons prefix on flasks is stupidly OP (we have 100% crit chance and fast cast speed so this is insanely good for us and gives the flasks massive uptime on bossfights)