Step -5 [1d20-1d20] Step -4 [1d20-1d12] Step -3 [1d20-1d8] Step -2 [1d20-1d6] Step -1 [1d20-1d4] Step 0 [1d20] Step 1 [1d20+1d4] Step 2 [1d20+1d6] Step 3 [1d20+1d8] Step 4 [1d20+1d12] Step 5 [1d20+1d20] Step 6 [1d20+2d20] Step 7 [1d20+3d20] Step 8 [1d20+4d20]