There are 2 builds for Lucian right now and 1 build for Yuumi. First build is full crit with: Infinity edge first (54.85% winrate) Essence reaver second (55.08% winrate) Navori flickerblade third (59.34% winrate) Seconds build is semi-on hit build, which provides more durability and damage vs high hp targets: Botrk first (52.55% winrate) Black Cleaver second (54.85% winrate) Essence reaver third (60.19% winrate) Alternatively, you can switch the order to reaver 2nd and cleaver 3rd. Insanely strong Yuumi build: W-E-Q max order Dream maker Imperial mandate first (54.69% winrate) Ardent censer second (55.97% winrate) Third and other items are optional.