Here's the text of the rule:-
Does this mean that a character can move and then use their action die but not the reverse? In other words as a character with a single d20 action I am not allowed make an attack roll and then move away? I think this is correct but could be clearer.A character has one or more actions each round, expressed as action dice. Most characters have one action die, which is a d20. Higher-level characters may have two or more actions, expressed as action dice, such as d20+d16.
Each round, a character or monster may move its normal speed and do one thing for each of its action dice. The actions a character takes depend on his Class.
All characters can take another movement for one of their actions.
When moving instead of taking an action this uses up one action perhaps leaving others available. Only a single action can be used for movement. So to use some examples that aren't listed, a character with a d20+d16 can do the following in addition to the examples given in the rules:-
- Move, Attack (d20), Move again (d16)
- Move, Move again (d16), Attack (d20)
- Attack (d20), Move (d16) (standard move not allowed after the attack)