Ple-Sen
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Well, even without buffs, he could still take down Erephir in one turn, as you wouldn't have any artifacts. It depends on what armor she's wearing. Because she can easily withstand one bomb to the head per turn, with her heavy armor and regeneration. With a double turn, it would be two. That's essentially 50% regeneration per turn. If you don't stand under him when her HP reaches 0, it's quite achievable. But if she were wearing a dress, it would be a different story. And you'd need to use some tricks with speed boosts.