There's far more that Taelia is involved in than I realized. Her VO is quite long. Let her train as a Paladin and become a new bamf Lady Paladin that we need!
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...before becoming what he does. Which I've always thought was stupid and entirely unnecessary storywise. Clearly only made because Blizzard can't let any storyline go and wants to bring it back.
If I remember correctly Blizzard waited to see how people felt about Bolvar's death and in the end they decided it was best to make him the Lich King. I personally liked the ending myself as it a loophole to continue the Lich King, while also not continuing Arthas.