Helzephyr Lux appears in Sakurajima (Lv 51–52) dungeons, and can be the dungeon boss. Dungeons open and close over time, so look for the cave icons on your map.
Base levels, plus what each job reaches at four condensing stars (light cells). The top level is 10.
TransportingLv 5 out of 10→ 8★4, Lv 8 at four condensing stars
ElectricityLv 4 out of 10→ 6★4, Lv 6 at four condensing stars
Condensing raises its jobs like this:
★1 +1 Transporting
★2 +1 Electricity
★3 +1 Transporting
★4 +1 to every job
Condense it at a Pal Essence Condenser (unlocks at Lv 14) using 4, 8, 12 and 24 more Helzephyr Lux for each star (48 in all). Or feed it Starfruit ☆1 to ☆4 from the Medal trader, or a Ripe Starfruit from the Bounty token exchange. The Condenser shows the new levels before you confirm.
Hauling: grabs up to 40 items from a pile per trip (Transporting 5), runs to it at 700 and carries at 450. At four stars: Transporting 8, 200 items per trip. Compare all haulers
The game picks the drop list by level: a wild Helzephyr Lux at Lv 70 or higher uses the World Tree list instead of the normal one, and at Lv 80 the Aura list. World Tree farming guide