Formula
CommonFun.calcBuff_3900
function CommonFun.calcBuff_3900(srcUser, targetUser, a, b, c, d, lv)
if srcUser == nil or targetUser == nil then
return 0
end
local HpPerRatio = 1
local Hp = targetUser:GetProperty("Hp")
local MaxHp = targetUser:GetProperty("MaxHp")
if Hp < 0.8 * MaxHp then
HpPerRatio = 2
end
local A = -0.5 * HpPerRatio
return A
end