Hello I'm new at this game so I do not understand too much, If you can help me I will really aprecciate.

First of all, I'm lvl 127 and I'm doing the missions of Doomed Maze, where I need to enter to Python Castle but when I enter they kill me really fast and I tried with a friend but the dungeon do not accept party, so I do not know what else to do, because I really want to keep going with the mission but I cannot pass the dungeon (If somebody can tell me any advice I will aprecciate). 

Then, another thing I will like to ask is How can I get a good armor (pants, boots, etc) Is It on missions, events or where?

That's all, thank you. I hope can somebody answer me C: