I've been planning encounters that come in two parts or have reinforcements recently, and it occurs to me that reinforcements don't have the same effect on an encounter as if they were there from the beginning?
How can I adjust for the reinforcements to make an encounter as difficult as if all enemies were present at the beginning?
- A fight includes a "generator" that spawns one creature (CR = APL - 1) per round.
- A fight on an open battlefield, the party mixes up with the scout group, while a squad of elite troops approaches.
- A party attacks a Drow Lady with her bodyguard, and three rounds later her palace guards arrive.
- An invisible wizard waits three rounds to see if his minions can take the party without his assistance, then beings withering the party with fireballs.
Drow Lady what a joke!