Let's get rid of mods this does not nor has it added any difficulty to the game as much as it added annoyance. So reworking would require getting rid of unstoppable and barriers all together and having triple threat health bars first being an elemental then a yellow and finally a red while taking down yellow and red bars on the Champions if not done fast enough this would trigger the elemental bar back and the champion could regen health while the elemental bar was active. Just a thought !
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Anti-barrier actually has good use outside champions. Guns with anti-barrier mods go through Phalanx shields, Knight walls, and Hobgoblin guards. Especially useful against Phalanxes when enemies don't flinch.