Because you are able to gain 20% exp regardless of your level or the mob level you can bring BF down to 1 HP and finish off with a low level leecher like how Krex leech is but much sooner Having a heaven hammer mule is required to making BF 1 hp and having an attacker that can pin like sair/bucc is recommended but not needed Per kill will net you (2.66m x 3.2 = 8.51mil x .20 = 1.7mil leech exp Lvl 35 with 300 accuracy(maple pop) = 12% hit chance Lvl 50 with 300 accuracy(maple pop) = 32% hit chance This strat favors range classes because of attack speed and double shot skills but warriors with final attack can be good. Mages can use accuracy gear to basic attack since they'll never hit them with magic accuracy issue Even though you can start at 35 you're better off doing Goby leech to 50 since your exp will be max-locked a lot meaning you cannot gain more than 1 level + 99% exp at once from a kill/quest For lvl 50-52 you'll need about 1.2m exp out of 1.7mil exp per kill so you're still getting the most out of your time leeching at 2 levels per 10-15 mins None of your characters can be in party while you are doing this because it will break the exp chain so that means you cannot Holy Symbol yourself Having multiple attackers on the same big foot wouldn't impact the leech exp so 1.7mil exp per 3minute possible(+travel/find time)? Proof of exp gain: https://royals.ms/forum/threads/guide-poison-mist-power-levelling.214621/ Credits to @DickDann for demonstration video