This mod backports the unique bossbar frame in 1.19 Cataclysm to 1.16.5 and 1.18.2.
However, since the 1.16.5 and 1.18.2 Cataclysm modfile doesn't contain the Ignis' bossbar frame, only the Ender Guardian and Netherite Monstrosity have it.
Modrinth: See here
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