Okay so I am rather confused about a particular part of the stealth mechanic in regards to Elves of the Valley Adventure from Dungeon Mag #178.
In the 1st encounter, it says the elves (enemies) get a round of surprise (provided PCs failed previous skill challenge) and then use stealth checks to hide whenever they can. What does that last part mean? How is this possible?
For anyone who hasn't played that part of the Chaos Scar campaign:
An enemy (who has advantage against the PCs because of a failed skill challenge) attacks on its surprise round. Next, during its turn, it attacks, then tries to make a stealth check to hide, I'm assuming after moving behind a tree nearby. Next turn, provided no one has found it, it can attack with surprise again. But what about the 3rd turn? It can no longer move and can't make a stealth check cause to attack it has to move out of the tree's cover, does it not? Or can it stand behind the tree and attack from behind it (logic being it leans around the tree, shoots a bow, and tries to hide again)?
Also, how do you prevent meta-gaming if the enemy reveals itself with an attack; aka the PCs will know it's behind that tree (regardless of how that mechanic works) and will march on over and attack it regardless?
I've read the hidden club guide and several other stealth guides, but none seem to address this issue.