Balanced Dagger: This item is unremarkable under normal conditions, giving you some extra XP for relatively easy kills, but in the long-run costing you popcorn and leaving higher-difficulty monsters on the board. In vicious-token difficulty, though, it's a game-changer that lets you level-up off equal-level kills when other opportunities are simply not available (and they often won't be). And yes, I'm aware it's a better item for beginners than veterans. Problem is, you need to beat Thief Silver to unlock it, so you're already past the "newbie" stage by the time you get it.
Goblin Assassin of Jehora Jeheyu: popcorn-bowl with WEYTWUT until you have petition and boost health, reach level 2 by the most convenient means, then start regen-fighting your way up. Thanks to boost health, you should be able to survive one hit to allow for poison fighting. Then use your swift hands for end-game popcorn consumption.
Mystera Warlord with Namtar's Ward: get to 16 MP and have mystic balance. With a prebuff and Namtar's Ward, you now can sustain four consecutive death protections in battle. Use refreshment for one extra DP per glyph conversion, schadenfreude potion for obvious purposes, crystal ball if you can get it, and of course a level-up catapult if feasible. If you can get your max MP to 20, then it's one mana potion to one CYDSTEPP.