Man how you all missed out on Stampede event, things back then were so different, and that's just 6 months ago. Game is changing rapidly, now you can't pack the strongest weapon inside tier 2 dungeon (tier 3 is the hardest). It is recommended to clear dungeon 2 with at least epic item (purple color). To clear the hardest one you need mythical (yellow color) or transcended weapon (red color, these items cost a lot btw cheapest one 450$ on enj market), but it can be done with good legendary weapon too (orange color) if you happen to find decent amount of healing potions.

Uncommon (green color) and Rare (blue color) items are good for practice and tier 1 dungeons. There are 7 tiers of weapons, it gets a little bit complicated with all those rarities :)

Only once I managed to find the mythical sword but I died and lost it at the end of the dungeon run. This game can get very hardcore at times.