The boss bugs at half health. Or the tier 3 refuses to complete and the boss just never spawns.
Game randomly crashed while I was writing this post😭
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Had this a few times, all the soft lock issues seem to be fairly consistently mitigated by slowing down. Instant melting of the shielded ogres or the main boss (first phase) blocks mechanics for progression. But if you don't insta-kill them, the mechanics work (more) consistently