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Same methods same everything, just do it in a 100% deli map, the loot from ultimatum will cap but your deli rewards will keep stacking.

You can easily see the interaction solo by just doing any deli map and running to the trial master. Need a group to reset the timer.

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over 3 years ago - /u/Bex_GGG - Direct link

This is not the case. When monsters stop providing experience and items, they also stop giving Delirium progress. This applies to monsters that spawn from Delirium fog as well. People who have done this and seen some reward progression are just seeing the expected amount from doing an Ultimatum encounter.