Check Out This Difficulty Analysis of Breath of the Wild’s Illusory Realm! - Zelda Dungeon
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Do you remember the battles against each of the Blights in Breath of the Wild’s DLC, The Champions’ Ballad? These challenges take place in the Illusory Realm and are notoriously tough, given the low-level armor, limited array of weapons, and minimal resources at your disposal. Would you be surprised to learn, however, that over time, they gradually reduce in difficulty? Gaming Reinvented, who are well known for their gaming news, interviews, and walkthroughs, have recently released a YouTube video following...

This is new to me, not sure if it’s more widely known. tl;dr you get fairies and healing meals if you are unsuccessful (either dying or restarting) the Illusory Blight battles in the BotC DLC.

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I tried watching the source video but found it grating, so I linked to ZeldaDungeon’s blurb. Source in the link.