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So, wondering what other people are using in one specific challenge.
Viego and then Jinx with Chronicle of Ruin makes for a rather... unfun grind. Chronicle of Ruin) Round start: Kill ALL units, then revive them

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about 1 year ago - /u/Dan_Felder - Direct link

Thresh with any relics that have an on summon effect laughs at the Chronicle of Ruin challenges. Guardian's Orb is particularly funny on that one, but everfrost and anything similar works too. Whenever Thresh is revived he counts as a new copy for the purpose of his level 2 effect by the way, so he can summon a champion on attack every time. Use your rerolls to get Galio or something similar, and put items on your champion or other items with similar "on summon" effects (like: "When I'm summoned, restore health to your nexus equal to my cost").

You don't need to use thresh but he's very effective due to his star power, last breath units, and level 2 ability. Otherwise, any champion with good "on summon" effects or relics works pretty well.