In Path of Exile, you may wonder that when can you start reliably using flicker strike and what are some good leveling items for it? Keeping an eye on poe buy items, you will get more gains. The following post are some useful guides for you.
The level to when you can reliably use Flicker Strike is when you get to equip whatever unique that will generate your Frenzy charges, or if you do enough damage to reliably kill 2+ enemies per Flicker (assuming you have Multistrike).
Terminus Est is 51 (generating with Crit Strikes) and Oro’s Sacrifice is 67 (generating with Ignites). If you have enough damage after getting Multistrike at 38, you can run Blood Rage and Poacher’s Mark + Blasphemy for a 46-55% change for a Frenzy Charge on kill. Until you get Terminus/Oro’s you’d have to use Frenzy to generate charges on bosses.
To be honest, it’s faster/smoother to just level with another skill until you get your reliable Frenzy generation. The one I was leveling with the intention of using Terminus was great using Frost Blades early and then switching to Cyclone after getting the Trickster’s Weave of the Arcane. Even more so dual-wielding two Brightbeaks to speed things up.
As far as leveling uniques that aren’t the “default” suggestions (Tabula Rasa, Wanderlust, Goldrim, Elreon jewelry, etc), two Brightbeaks makes Leap Slam super fast, especially if going Trickster and getting Weave of the Arcane for no cost movement.
There are three variants: Flat Elemental (rares with stacking added ele via Abyss Jewels), Pure Elemental +1 phys damage (Cospri’s or etc with 1 flat phys on abyss jewel or ring), or conversion (from 80% Watcher+Winter Spirit to 99% 50%+20%+29% Watchers). Claws should be able to deal with a higher phys dmg, depends on your leech and phys mit. Only downside is you can’t really do heavy physical bosses like Malformation Piety.
Or you can level with flicker reliably with crit chance builds and gear and using terminus 2h sword + bloodrage + poacher mark. Eventually you can even drop blood rage if you want and change poacher mark for assassins mark.
I believe that other experienced players may have better guides than me, but these are very important factors that make me successful, I hope it will also help you.