Blade will probably help you a lot more Aegon was supposed to be great for act 6, but we know how that went with 4*s so Blade will help you in the here and now.
Have to agree with MrChad's first part ... considering the cost to upgrade 4* ... knowing they won't help you eventually, there isn't really any point . funnel your resources/effort into 5* .. save up to rank up a 5* .. progress will be a bit slower, but at least you'll have useful champs later .. LOL
Don't listen to the guys telling you to wait for 5 stars. 4 star champions are usable in 90% of content the only thing they can't do is Act 6 but they will get you through event quest and other challenges. if you need a labyrinth of legends option an awakened aegon can even do that for you.
I don't have him but an awakened AEgon looks like a beast. Thing is amazing and I have a soft spot for Darkhawk but I wouldn't recommend him over the others. Blade is great and Regen on command plus danger sense and bleed is a hard to beat combination but I'd go for AEgon or Thing personally. "Luckily" I have almost none of them above a 3* so I don't have to make that difficult decision. Is lucky the right word.hmmm
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