1 monk = 100%
1 monk + 1 elemental = (100%-20%) X 2 = 160%
1 monk + 2 elementals = (100%-20%-20%) X 3 = 60% X 3 = 180%
"The Monk can split into up to 2 elemental monks at a time. " No third elemental.
Not a big deal on power. THE DURATION might get them OP in bosses: "The elemental warriors will last until the Monk cancels the effect or their target dies."