And yeah, they should be able to attack different targets or even move between attacks if they want to. From the Player's Handbook, Chapter 9: Combat, Movement and Position, Breaking Up Your Move (just getting all the subtitles in there since I can't give you a page number
):
Moving Between Attacks
If you take an action that includes more than one weapon attack, you can break up your movement even further by moving between those attacks. For example, a fighter who can make two attacks with the Extra Attack feature and who has a speed of 25 feet could move 10 feet, make an attack, move 15 feet, and then attack again.
That certainly changes things.
In that case you are probably right ... another action indeed seems like the only way to implement this. :-/
limit it to one spell per action type. So a Hasted wizard could potentially Misty Step (bonus action) away from melee, throw a Fireball (action), but then not be able to throw a second Fireball with his Haste action but have to lob a cantrip at the enemy instead.
I cant quite imagine how would you like to explain this rule to new players.
I would explain it like I just did. When a player tried to use another spell with another action type I would just have a red text notification appear that said they couldn't and why, just like how it does now when you can't move rocks and so on.
That could work ...
But i meaned before they do something ... i mean its not hard to simply let all unusable spell icons to become inactive with red writing teling "you allready used simmilar action" ...
But how to explain it in advance ...
I mean:
If you say: "Cant use same spell twice" ... i would like to cast Fireball + Shatter ... would it be possible?
If you say: "Cant use same type of spells" ... i would like to cast Fireball + Magic Missiles ... would it be possible?
If you say: "Cant use second damaging spell" ... i would like to cast Fireball + Sleep ... would it be possible?
Take it that im DnD lame, i have no idea what "types" of spells are there ...
