Akali 2XKO combo: 552 damage, expert, by Katsugami. Warning: this combo requires a lot of precision. Do not mash your inputs, as each action flows natural…
M > H ~ 3H > j.9 > j.[H] > 9 > j.H > j.2H > M > 9 > j.L > j.H > j.2H ~ M > 2M > 2H > 9 > j.M ~ j.H > j.9 > j.M ~ j.H > j.S2 > 66 > 66 > S2 > S2+M
Warning: this combo requires a lot of precision. Do not mash your inputs, as each action flows naturally into the next, but the timing must be exact. To make the first step easier, after 9 > [H] > 9, you should keep holding the forward diagonal jump (9). This way, as soon as you land, your character will automatically jump again on the very next frame, helping you get the correct timing without needing to press the input again at the exact moment. Use the frame bar to identify this first grounded jump: it should show the 4 landing lag frames (white bar) after j.[H], followed immediately by the 4 jump startup frames (white bar).