Alright, lowdown on the Knight:
KNIGHT
OVERVIEW
-The Knight is the toughest player in the game, and is designed to hold the line against multiple enemies and even bosses. Max out on Health an you'll have more than the castle!
-However, the Knight is also the slowest and shortest-ranged player in the game, and so is useless when out of a fight.
-The Knight is the easiest class to start out with, as your main strategy will be to dive into the fray and chop at everything that moves.
-However, the Knight is also the most difficult class to master, as high-level play requires careful coordination and judgement.
BASICS
-As a Knight, your job is to keep the Magician safe. He's squishy, you're armored. He does the healing, you do the killing. It's perfect symbiosis. The higher the level at which you're playing, the more this connection becomes important, since you'll need his mana and his healing to stay alive.
-Always stay close to your Magician, and always keep an eye out for him. Most Magician deaths for me happened because I was too focused on the killing and didn't notice my buddy was getting pounded on. If he's in danger, drop everything to help him (except if a boss is whaling on your castle, but we'll come to that).
-The only priority higher than your Magician is the castle. If the castle is attacked, you need to be defending.
-Always attack the strongest enemy first. If left unchecked they can severely damage you or the castle, which means the Magician will have a harder time keeping you alive. If a lesser enemy gets past you, you can always take care of them later.
-If you're losing a lot of health, pull out of the fight and wait for the Magician to heal you. If you don't, you'll get creamed. It's better to let the enemy gain a few feet more in a fight than to decimate your team.
-If you want to move, do not use the "Attack Move" button, since you'll stand stock still and continue attacking if you're close to enemies. Instead, use the "Move" button, which'll allow you to move to your destination regardless of whether you're being attacked or not.
-Always keep Rage up. It's an incredibly powerful damage and health boost, and without it you'll suffer in the later waves.
-Try to align targets with Mighty Dash before charging, since you'll incapacitate all of them after upgrading that ability.
-Use Stomp when overwhelmed. If you're up against a boss and/or a lot of enemies and are taking a lot of damage, this can give you and your Magician a short breather. Use this if enemies are attacking the castle.
-You have a priority over the Ranger for Health and Mana Potions, but the Magician has a priority over you. However, you have a priority over everyone for speed potions, since everyone else is faster than you.
Starting a Knight (Levels 0-20)
-Prioritize Health above all other stats. You already deal more damage than the other classes at the start, and you get lesser returns for sinking points into Damage or Attack Speed instead of Health. You will need this to survive against multiple and powerful enemies, especially since your Magician at this stage won't be near you.
-Start by choosing Rage. It'll give you the ability to one-shot most enemies even without upgrading your attack power, and the Fast Recovery upgrade will allow you to survive entirely on your own.
-Time Rage so that you always recover the Mana you spent from using it before doing so again. Here the Magician won't be as reliable when it comes to replenishing your Mana, so you'll have to manage your resources wisely.
-After maxing out Rage go for Mighty Dash, and pick the Afterburner upgrade. This'll be your mobility ability, and will allow you to get across the battlefield very fast, for example when defending the castle.
-At low levels you're going to be defending a side on your own. Communicate with the rest of your team and check on them regularly.
-Remember that most Badabooms (the fat guys with tribal masks) will die from the sunlight before they can reach the castle, so don't feel obliged to kill them if you can't.
Playing a Knight (Levels 20-60)
-At these levels the Knight is at his weakest. Be warned, you're going to die pretty often here, since your damage output isn't yet at its maximum. This is a good time to master escape tactics.
-After maxing out Health, focus on Attack Speed, and then Damage. With Rage you'll still be able to kill most enemies in one shot, and the attack speed will help you handle crowds better.
-This time, stick to your Magician. By now he should have fully upgraded Heal, and will be able to constantly restore your mana. Use powers at will, but do so outside of combat to avoid standing around defenseless while activating your abilities.
Mastering a Knight (Levels 60+)
-At level 60 you are by far the strongest player in your team. You have the most health, the highest damage output, the most crowd control (stun) abilities, and the most speed when using Mighty Dash. Here, after maxing out your health and damage the only thing left is Mana, which is completely useless when you've got a good Magician.
-Don't get cocky, though. Waves at this point, especially the final ones, get really tough, and even with your awesome power you'll die quickly if you don't play smart. Pull out if you're low on health, and retreat when you're overwhelmed.
-You're going to have to make regular trips across the map to help out your Ranger. Even if he doesn't ask for help, check on him, and use a Mighty Dash to get there quicker.
-When you're fighting three bosses at once, it becomes hard to kill off stragglers. Unless you're confident your Magician will take care of them, you'll need to move towards every individual enemy to catch their attention.
-In addition to keeping Rage up at all times, you're going to rely on Mighty Dash a lot to get around. Always try to hit as many enemies as possible when boosting yourself around.
COMMON MISTAKES
-Fighting outside the screen. Yes, it's funny that you're killing people you can't see, but it also means you don't know what you're fighting, and as a result you can die very, very fast. Moreover, it means the Magician won't be able to heal you, which affects not only you but the rest of the team. Stay away from the edge of the map in general, since you can't respond if you get attacked from out-of-sight ranged enemies.
-Forgetting the "I need Health!" button exists. It's especially made for Knights in a pickle, and is faster than typing the same in chat. Normally your Magician should be perceptive enough to notice you're dying, but that doesn't always happen.
-Running towards your Magician when low on health. By doing so not only are you making it harder for the Magician to target you and not himself when healing, but you'll also pull every monster you didn't kill yet towards him. If things go well, he'll escape in time to heal the both of you. If things go badly, you'll have killed yourself and the team healer. Instead, run on the side of the path opposite the healer so as to maintain a distance.
-Standing by the castle during an entire wave. I cannot stress enough how moronic this is, so let me tell you that this is the most unproductive, unpleasant and unsuccessful tactic in the game. Of all the classes to do this, the Knight is also the worst. By the time any enemies get in range they'll already be attacking your castle, and while waiting for them you'll have deprived your teammates of a powerful damage dealer and absorber.
So that's it for the Knight. More coming soon!