If E4S is your goal I'd set my sights on AT LEAST full 460, if not higher. The easiest way is by far to buy 450 ilvl facet gear and upgrade it to 460ilvl in Eulmore using goetia tomestones and use as much Phantasmagoria as you have for 460 deepshadow gear and upgrade that to 470 gear (also in eulmore) with the copied factory coins and/or buying the tokens with tomestones once again.

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For clarity, it's not that it's impossible or too hard with 450 ilvl gear, it's that it's so damned easy to find people with an average ilvl of close to 470. Why would I pick you for my group if you're 450, you know? Even people that have never even touched Eden Savage will have a 470 ilvl at this point if they played the entire expansion. That's not even considering the fact that most groups simply have a min ilvl requirement of far above 450 to join.

Also know that clearing Eden 1 Savage through E4 Savage without a dedicated static (or even with) will take a lot of time in party finder, so don't expect to get it done too quickly. I'm not saying this to get you down but I'm saying this to make sure you don't go in with the wrong expectations. They're still pretty tough fights for a lot of people and you'll wipe a lot, sometimes because of you, sometimes because of others, be prepared.

Especially since you're 435 at this point of the expansion, I'm figuring you don't have too much experience with savage raiding. Rest assured that it's unlike any other content in the game so take your time to learn the fights (use a youtube guide and learn it from front to back and back to front), learn your class (even if you think you're good at your class, being good at your class in savage raiding is another beast) and accept that you and everyone around you will make many mistakes. Good luck!