The first time this setup clicks, it feels less like a normal caster build and more like you are abusing movement as your main DPS button. Every Blink sends you across the screen, and when the crits line up, Comets start chaining so often that pack clearing turns into a blur. That kind of speed is exactly why many players end up checking Path of Exile 2 Currency (https://www.u4gm.com/path-of-exile-2/currency) early, because the build becomes much better once you can fix the awkward gearing gaps instead of waiting for perfect drops.
How the Blink CoC loop actually plays
The core idea is simple: Blink is not just movement here, it is the trigger engine. You stack enough crit chance, cooldown recovery, and mana sustain so each short burst of movement keeps firing Comet through Cast on Critical Strike. When it works, the build has that slightly ridiculous feel where you are never really standing still long enough to play like a traditional spellcaster.
What makes it fun is also what makes it a little annoying. If crit consistency drops, the whole rhythm feels off fast. In my experience, most players will probably notice the build feels amazing in dense packs but much less clean when you are undergeared or missing recovery. That is why people usually want to solve mana and trigger uptime before they chase raw spell damage.
What to prioritize on gear and tree
You do not need some wild one-in-a-million unique setup for this to work, but you do need gear that supports the loop. Look for crit chance, crit multiplier, cooldown recovery, mana regen, max mana, spell damage, and defensive stats like ES or evasion. Cold damage also fits naturally because it scales the Comet side of the build well.
Fix mana sustain first, or the build will feel worse than it looks on paper.
Do not overinvest in damage nodes if your crit rate is still too shaky to trigger consistently.
Take cooldown and recovery mods seriously, because they affect the whole tempo of the build.
Keep a backup movement skill ready for awkward boss mechanics or bad terrain.
Where the build feels great and where it gets messy
Mapping is where this setup really earns its reputation. Fast packs, stacked monster density, Breach-style chaos, and anything that rewards movement all play into its hands. You keep blinking forward, Comets keep falling, and you spend less time aiming than you would with most spell builds. Bossing is still very playable, but it is more sensitive to downtime, immunity phases, and any mechanic that breaks your rhythm.
The build also has a funny habit of punishing impatience. If you rush into danger without checking your recovery or defensive layers, the teleport spam can get you killed just as fast as it kills monsters. That is the part newer players tend to underestimate. The build looks like pure offense, but the smoother versions usually survive because the player keeps moving smart, not just fast.
Why Gemling Legionnaire fits this setup so well
Gemling Legionnaire works because it gives you room to breathe on gem scaling and utility, which matters a lot when a build depends on multiple pieces lining up at once. You want enough flexibility to fit support gems, enough efficiency to keep the loop going, and enough defense to avoid getting deleted while you are in the middle of your Blink chain. For players who enjoy strong skill expression and do not mind some gearing pressure, this is one of the more entertaining endgame setups in PoE 2, especially once you have the resources to smooth out the rough edges and maybe even buy POE 2 Currency Orbs (https://www.u4gm.com/path-of-exile-2/currency) when the market side starts to matter more than the farming side.