babomb
First Post
I think it really depends. If the encounter is too hard because the PCs did something stupid, do nothing, except possibly to prevent a TPK. If the encounter is purposely too hard because you don't want all of the encounters to be balanced for the PCs, do nothing, except possibly to prevent a TPK. (The PCs should run away in this case.) If the encounter is too hard because of some mistake you made, mentally lower the enemy's HP, or have him use sub-optimal tactics. You can also have an NPC help them, but this seems contrived (because it is); use sparingly.
If the encounter is too easy because the PCs did something clever, do nothing (but make a note of it so you can use it against them later!). If the encounter is purposely too easy because you don't want all of the encounters to be balanced for the PCs, do nothing. If the battle starts to drag on because there are large numbers of low-level mooks to slice through, you can have them run away after a significant portion have been killed. (This actually should happen in most encounters unless the enemies are non-intelligent or have a good reason for not running, but it's worth making the point here.) If a fight is too easy because of some mistake you made, do nothing; you can always make the next encounter a little tougher.
If the encounter is too easy because the PCs did something clever, do nothing (but make a note of it so you can use it against them later!). If the encounter is purposely too easy because you don't want all of the encounters to be balanced for the PCs, do nothing. If the battle starts to drag on because there are large numbers of low-level mooks to slice through, you can have them run away after a significant portion have been killed. (This actually should happen in most encounters unless the enemies are non-intelligent or have a good reason for not running, but it's worth making the point here.) If a fight is too easy because of some mistake you made, do nothing; you can always make the next encounter a little tougher.