Predecessor Builds > Skylar > Skylar OHB 1.2
After the Skyler nerfs she plays a little too weak to stack now in the early, and you give a lot away in objective taking by not building sky splitter first.
Plasma Blade still the must have for PVP damage.
Imperator this early would feel terrible on most carries, but you're lasering for a an instant 40% plus the 20% on imp, so it's a fast ramp to 60% crits with 25% additional damage on the laser. Besides this, this is a high power item and we're now using:
ORTUS! Ordinarily I feel like this is a bad crest for a carry. You just cannot outscale attack speed as an ADC, but Skylar spends so much time in beam it really doesn't translate to enough value to take a marksman, you could argue that there's versatility in air dashes but Ortus has a niche in that you gain additional movement speed with the power. This movement speed in the air when you're running down a kill feels incredible, they have to commit a blink to escape. Nice to actually scale too. Plays no differently because bread and butter is in the laser.
Demo because your laser crits.
Terminus because you're a carry that doesn't need attack speed. At this point in the build staying healthy is important around objectives and this is the best item for that. High power again, remember ortus is % based so more power = more value than say pen, crit, AS or on-hit.
Infernum, you're soft capped for crit at this point, no reason not to throw on an easy applicator % HP damage. Regardless of current HP this will sting. Remember your job as carry is to do most of the work, not necessarily finish the low health targets by putting yourself out of position, so this will achieve more than vanquisher. (Which is a poorer item for skylar as her damage in beam ramps up and Vanq passive cuts off the final section of enemy HP.)