Staffmod Tier per iLvL:
01 ≤ iLvl ≤ 11: T1, T2
12 ≤ iLvl ≤ 18: T1, T2, T3
19 ≤ iLvl ≤ 24: T1, T2, T3, T4
25 ≤ iLvl ≤ 36: T2, T3, T4, T5 (D2C: iLvl ≥ 25)
37 ≤ iLvl ≤ 99: T3, T4, T5, T6 (D2X only)
Nothing about that general logic changed with RotW.
And Goatman is a T1 (lvl 1) skill and Bind Demon is T6 (lvl 30)
i has questions so ill take to pm and edit this thread after