The best trinket is the Yen Yang pendant. It's a forge item; you need 12 fiery essences, 12 water essences, the drops from the Glacial Wyrm threesome, and the drops from the bottom right fire demon threesome.

The upgraded class set doesn't provide enough HP or armor to tank the serious bosses, and I would skip it most of the time. In the lategame, time is the most valuable resource, so the set you use depends on your drops. The visage set (galaxy robe+ken-peng wings), the haotian set (Saint Legacy Boots+Supreme God of Heaven), and to some extent the Buddha Set are your best choices. The Asura Godslayer mask is pretty much the single best headpiece option in every set you build due to it's +HP and %HP regen.

Magic Omniscience is really annoying to build because you need 6 drops and they only drop from the blue and red storm spirits.

As for weapons, your best choice is the Saint level item that you can forge. It requires drops from Monkey King, Brow Ancestor, Mahasvera, and Dipamkara. You have to buy several weapons with points to complete the upgrade, plus a Huan Yuan stone for the final tier.

thanks

I really appreciate your piece of advice, it helped me while i was play-testing on solo easy mode:

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I didnt farm the suggested trinkets, but anyways, i already found out how to get chaos bow saint and the haotian set + asura godslayer

Keep in mind that several stats in this game have no impact on gameplay. These include the cooldown reduction and mana regeneration. I don't know if they're planning on implementing these later in the future or not.