Abilities
Below 40% health, LeBlanc turns invisible briefly and creates a harmless decoy for 8 seconds.
LeBlanc marks a target with a sigil; damaging it with an ability detonates the mark for bonus damage.
LeBlanc dashes to a location, then can reactivate within 4 seconds to return to her starting point.
LeBlanc fires a chain that roots the first enemy hit after 1.5 seconds.
LeBlanc casts a mimicked version of her last basic spell, dealing increased damage.
Guide
Play as a mobile assassin, poking with Sigil of Malice procs and using Distortion to reposition. Look for picks on isolated enemies with your full burst combo, then reset with your ultimate's mimic.
Tips
Use your Distortion (W) to poke and escape, but save it for dodging key abilities in ARAM's narrow lane.
Maximize Sigil of Malice (Q) damage by proccing it with your other abilities for burst combos.
Build Luden's Companion for waveclear and poke, essential in ARAM's constant teamfights.
Take Snowball to gap-close or escape, then follow up with your full combo for picks.
Focus squishy targets first; your burst is wasted on tanks unless they're low.
Combos
Q > R (Mimicked Q) > W > E for instant burst and chain CC.
W > Q > R (Mimicked Q) > E for a gap-closing burst combo with root.
E > Q > W > R (Mimicked Q) for a pick combo from fog of war or brush.