This will be a super intense feather investment to make a 5-star +10 and will cost you 220,000 feathers total assuming you only pull 4-star Cecilia copies and not counting the 20,000 to ge a 5-star Nino for Gronnblade+. Add 2,000 more for every 3 star you pull instead.
If anything, I'd like to recommend that you make a 4-star +10 instead, which is the same (usually) as being a 5-star +5 for much less severe investment, only costing 20,000 feathers for Gronnblade+ and at most 22,000 feathers for Cecilia assuming you pull all 11 copies at 3 stars only.
edit: +atk/-defense is her best iv set
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