Definitely upgrade. One merge is +1 to two stats, but with upgrading, every stat goes up by like 2/3 points, in addition to the fact you get more skills, including the 5-star weapon skill (In this case, Dark Breath+, which is superior in damage and effect). Of course, it'll cost you a bunch of feathers, but it should pay off more in the long run.
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Fate Grand Order
Dragonball Legends
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