My question here is what is the right combination of the answers from these two questions:
- Does Extra attack stack with haste?
- Can you get an extra attack after casting a spell whilst hasted?
Assuming I'm a level 5 fighter / level 5 wizard and I cast haste on myself.
It's clear from the second question I can then proceed to use the attack action as per haste. My interpretation:
- RAW is you get only one attack and extra attack does not get triggered as per the answer to the first question.
RAI it looks like that particular line "one weapon attack only" was intended to limit attack explosion on the fighter:
The "one attack only" stipulation is preventing the use of the extra attack feature in the additional action, so a character with extra attack could use his regular action to make 2 attacks and use the additional action granted by haste to attack once more. This is to prevent say, a fighter at level 20 who gets 3 extra attacks from having 8 attacks in a single turn on top of a possible bonus action.
As specified in the answer of this other question.
Is there any indication (by WOG or similar in either direction) as to where in this particular scenario the fighter would get the extra attack? Which would mean, if you cast haste on yourself on your turn, the effect of casting haste is you get to do your turn as normally without the benefit of haste but also without having lost the action into casting haste.