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After having opened the reward loot boxes that gave random items, which all ended up being pretty insane, I decided to open the next group of items, those being the specific chests that the bosses gave away.
The items were these:
[Lesser Legendary Relic of the Great Tundra Crystal Crab Tyrant Emperor] x1
[Lesser Legendary Relic of the Golden Scaled Dawn Serpent Tyrant Empress] x1
[Lesser Legendary Relic of the Great Lightning Mole Tyrant Emperor] x1
[Lesser Legendary Relic of the Giant Feather-Winged Wyrm Amphithere Tyrant] x1
[Legendary Relic of the Grand Giant Blazing Drake Wolf Tyrant Overlord] x1
[Legendary Relic of Giant Winged Nine-Headed Golden Wyrm Dragon Overlord] x1
[Phantasmal Relic of Great Thunderstorm Dragon Tyrant High Overlord] x1
[Phantasmal Relic of the High Thunderclouds Dragonoid Giant Tyrant High Overlord] x1