Die step

This game mechanics is obsolete and replaced by weapon dice multiplier. Effects that formerly increased die step now instead add 0.5[W]. For monk damage progression, see Unarmed Strike.

According to Monk fist damage you get die with 2 sides more each die step you go up for monk die step bonuses.

2d4 -> 2d6 -> 2d8 -> 2d10 -> 2d12 -> 2d14 -> 2d16 -> 2d18 -> 2d20