As our supplies (runes and potions) are infinite, you should bring one strong mana potion and one supreme health potion and use your supreme health potion as your exura med ico, always cure with it. Bring one ring (axe, sword or club) for your skills. If you want to, you can also use SSA and Might Ring, it depends if you want to spend money on it or not. As I don't know the level of your knight, I don't think it is a good thing to always use utito tempo, because you'll take a lot of damage. Only use utito when there is 2 monsters with you, except if those monsters are Hoodinion and Mearidion. Also, use exeta amp res to bring Hood and Mearid to you.
For what I learnt playing Tibiadrome, the monsters that deal more damage is: Hoodinion, Mearidion, Scissorion, Domestikion and Murmulion. So the best thing is to kill Hoodinions and Mearidions first. But, if your wave don't have Hoodinions and Mearidions, you should focus first on Domestikions, as they increase the damage you take from other monsters.
The monsters don't have any weakeness, so use the weapon you prefer to kill the waves. I use prismatic set to kill the waves as I don't want to spend my imbuements there, but the best thing is to use your best set to face the waves. As you're using supreme health potion as your main cure, you don't need much of life leech, so the best imbuements you can use is a critical and mana leech on your weapon and a mana leech on your helmet.
The best strategy I found for me is to stand on one room's corner and wait for the wave start. So, probably one or two monsters will target you. You kill them and then go for the others. This way you can stay still while you kill them. But if you get more monsters standing on corner and can't handle them, you run around while killing to heal you and attack the one with lower life. If there is a Hoodinion or Mearidion and you get more monsters and need to run, you can let your summon attack them while you attack with exori gran and exori ico the ones that are melee.
The worst modification for EK is the one which melee monsters teleport to you, because as you're standing on corner they can go there and make things harder than it has to be. I advise you to ignore the modification that gets you superdrunk and the root one, you receive more damage but it is not so hard if you have 2 monsters on you. It is better you stay on corner and receive more damage than run around and lure more monsters that depending on the wave, can get you killed. The modification that teleports YOU to a random place in the arena can be useful to escape death so maybe it is worth to stay on marked SQMs.
And do all of this with your summon. I always use my summon as soon as I enter the drome, but you can use it later if you prefer. If your summon have low life, you can wait with the last monster until your summon heal and then kill the last monster. Of course only do it if you have time. Also, don't let more than 1 creature attack your summon, he can die easily, only let it if is Murmulions attacking.