So per RAW you cant start an activity that you cant finish during a round in combat. The most obvious effect of this rule is that a caster can only cast one spell a round and then has to find something else to do for their last action.
However if we removed this limitation I think it adds some interesting strategic options.
Action 1-2 cast fireball
Action 3 begin to cast another fireball
Action 1 on my next turn: finish fireball
Action 2-3 cast lightning bolt
The interesting thing here is that while you are casting between rounds you would of course attract the attention of all the mobs who probably want you dead.
Critical hits from normal attacks would now disrupt your spell as if it was an attack of opportunity.
For casters it would increase spell output at the risk of losing spells to disruption or attracting additional attacks.
I am playing around with using this as a house rule but thought I would put it out to everyone in case I am missing some super OP pain in the ass thing I am not thinking of.
I have no idea if this would be balanced or not (I'm leaning towards no, but again, not sure) but I love this conceptually as a way to allow casters to interact with the 3 action system more.
I think it would be too easy to abuse. You can set up an incredibly powerful combo to fire in the same round, without giving your opponents a chance to react or heal.
I think it would be too easy to abuse. You can set up an incredibly powerful combo to fire in the same round, without giving your opponents a chance to react or heal.
Ehh, true a BB Lich could potentially annihilate a group with two back to back spells.