More like my two ideas for the day... apologies if they've been discussed before.
Trojans
I remember the first time a Trojan came into play during one of my adventures. I immediately was shocked and intimidated by its presence and had a sudden sense of fear in my stomach. I was starting to feel my palms sweat and pulse raise.. then the trojan fizzled out and popped. Easily and quickly. I often battle the trojans in the arenas and everytime I do, I wish it was a longer fight; with some "lesser enemies" spawning during the battle. I simply wish such a menacing looking enemy was harder to defeat. He does hit hard and his moves are wonderful, but he simply goes down too quickly.
Rare Level Variations
I'm not sure if the level design or instancing of levels could allow for small variations (or trick us into thinking its a "variation") but it would be wonderful if levels could have an occassional chance of offering something special... hidden... a 1 in 500 or 1 in 10,000 chance at seeing something new in a level. For example, (maybe silly examples but thats not the main idea) suddenly has a hallway to a miniboss (or free challenge room) that normally is not there. Maybe a floor switch, that seldom appears, opens a wall (rather than a gate) that leads to.. mass carnage and a nice reward. Hahaa... or perhaps a very rare 4th room at the end of existing arenas that is available randomly (and extremely rarely) with an enemy so seldom seen that many players believe it to be a tall tale or hoax-rumor. Basically, if it is at all possible to offer rare and random, discoverable challenges within the levels we have memorized (to shake things up and keep players on thier toes)... I think we'd love it.
I second both ideas.
I think the Buffed Trojan should rather be a second type of Trojan that has a re-skin but functions the same move-wise. Reason being: in most cases Trojans feel too easy, but some of the ones in Firestorm Citadel (particularly the last rooms) are plenty nasty enough considering the circumstances (two at once, three trillion skeletons, fire and spikes all over the place) =P
Also for the level variations, I like the idea of rare minibosses as outlined on this thread. http://forums.spiralknights.com/en/node/11241
I wish there was a better way to rally on this so that it could get more attention. I think Vog or a living Vog Cub would be an awesome secret boss.
Also also: I hear a lot of people talk about secret areas in graveyards. I don't hit many graveyards unfortunately (I love them) but I've hit a few since hearing this. I don't know what exactly people are considering "secret areas" but I always clear the whole thing and I've gone all around them looking and haven't found anything that I would consider hidden (secret). I've heard there can be paths behind energy gates but have seen none. Any insight? Is it only in T3 graveyards? I don't know if I've ever hit one of those.