Derren said:
And here is the problem.
Either the minions are still strong, then the irresistable command will not see much use as it is tactically better to let the devils live.
If the minions are weak so that exploding them is the best thing to do then the PCs will likely ignore everything the Pit Fiend summons as they pose no thread and gang up on the Fiend.
Also the debuff only works for 1 round.
By this same logic, one should never sacrifice a piece in chess. Either the piece is strong, so it is tactically better to let it live; or if the piece is so weak that sacrificing it is the best thing to do, then the other player will ignore it and concentrate on your king.
In reality, of course, skilled chess players often sacrifice pieces, because there is a specific tactical advantage to be gained that outweighs the loss of the piece. And a chess player is exactly what a pit fiend ought to be. The minions are useful to have alive, but sometimes it's worth it to blow one up.
Derren said:
Those examples are very specific and don't happen as very often. Certainly not as often as to justify the use of irresistable command every other round like in the tactics.
Case 1. Requires metagaming, also doesn't happen very often
That PCs are in low hit points? You're a lot nicer to your PCs than I am to mine, then. It happens all the time in my games. As far as requiring metagaming... to some extent, but the pit fiend should be able to judge when an opponent is reeling and on the ropes.
Derren said:
Case 2. Only really feasible in the first round before teh PCs spread out.
That's assuming the PCs do spread out, and the other devils don't push them back together in some fashion. If nothing else, the mere threat can make life more difficult for the PCs, since they have to avoid getting clumped up.
Derren said:
Case 3. Happens more often than the other cases, but the question is if the legion devils are so weak so that they are only good as ammunition -> PCs ignore them and gang up on the Pit Fiend or they are still strong -> Irresistable Command won't see much use.
What? This makes no sense. The legion devils are presumably sturdy fighters, but not as tough as the fiend itself. I suspect they will have a higher offense-to-defense ratio than the pit fiend, making it profitable for the PCs to take them out first. Irresistible Command offers a way for the fiend to get a little extra out of them before they die.