@Vinz yes, you can find Eternal Maps. Farm Builds with high Luck and Eternalized Set with Treasured Perk give the best chances for finding them. if you want to focus on getting a few in a short time, just run through a Challenge Map to the Cartographer and kill him for the map. only save the Eternal & Legend Maps, buying a Challenge Map from the shop on a lower floor. you can convert a Map to a higher floor using Gold. after you have about 10-20 Legend Maps, do them all in a row with your Eternalized Farming Build. Legend Maps increases your Luck & chance for Eternals above the cap. after you get however many Eternal Maps you want, farm them all in a row, cleaning out each map for huge amounts of Loot!
@Mastoleee for leveling your Wizard, if you just want it for PVP, you only need to level it to 99 once. just have it be a Hireling on one of your other Characters, make sure they both have max +200% Exp, and the Hireling with lots of survival for floor 100-110 M3 (floor 100 is where monsters max out on Exp they give. there are some nice posts on the subject.)