There are two conflicting factors for your case:
1) Black Knight may not be worth the investment of such a premium skill since he is most likely never going past +1 merge -- now that Zelgius is available.
2) Even though Zelgius can get more merges, like any other 5* exclusive, he is not cheap. So unless you are set on summoning more Zelgius, his Warp Powder works well in mix teams -- a bit more common now that you can't use a highly merged Zelgius for your main scoring team.
So I would really save your Vengeful Fighter for a future +10 merged enemy phase armor unit. A +1 merged unit really doesn't justify the use of such a premium skill.
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