SRD
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The choice for dealing with deaths isn't obvious (I mentioned this earlier, around page 2), but for the Knights, the purple one is clearly better – I was talking about them, and the choice is clear, even though they are equal individually – one might be weaker, but it significantly reduces damage through weakening, but the Necromancer likely has something similar, and it's also a general ability, so the one with the weakening strike is much better overall.
Added 1 minute ago
HP and defense are higher.
Added 1 minute ago
HP and defense are higher.