During an echo in the Reign of Dragons (sorry can’t remember the map name, but he spawned at an upper level after stairs, desert tileset) Spymaster Zerrick became invisible and invincible. He can still cast his ground AoEs but there is no way to damage him. This basically makes the echo unbeatable. My build has huge AoE and nothing could damage him as far as I could tell. The boss HP bar at the top of the screen was not showing up either.
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