I am an new GM playing DnD-4E and i am looking for some tipsadvice on how to spice up an encountercompose challenging encounters.
I have played with my group ~10 times so far and what i really like is to challenge them. Not a TPK but almost.
I started with same level monsters as the players, which was obviously no challenge at all.
I tried to overrun them with a lot of minions, but found that it is quite difficult to manage to keep track of to many foes, their hp, initiative, ongoing effects and damage ect.. (so i now using cards, which helps somewhat) what i like here is that if the minions are slayed to fast there is always an infinite amount of additional which could join.
I also tried a young dragon once, hoping that its high hp and higher defenses will stress the group for a while, however i found out that it is of disadvantage to be able to do once action per round while 5-6 PC will be able to do one. If the defenses of an opponent are high enough to keep him alive for a while then players get frustrated that they waste several powers till they manage to land a hint. Also if the brute does high damage, they complain that they can be brought down in 2 hits.
I also tried compositions of foes, but the Players take them apart almost always the same way, ( the clerics, the spell-casters, the artillery, the soldiers, .. )
Last game a player (arcane striker) was missing and the game was going surprisingly well. The foes were 2 bugbears (brutes) and a few archer goblins in the back. While the players cleaned out the archers, I had enough time to land a few good hits with the bugbears to put some PC's into bloodied and make them retreat for a round to lick their wounds.
I am looking specifically for what is a good composition of foes is to challenge Players and make the encounter more interesting (not the standard round of move, attack, roll damage ). I do not want to try all possible combinations, i am looking for some recommendation what has proven to be a good mix, (e.g. two brutes in the front, 2 archers in the back and one controller on the side)