You can get lvl 1 (Crit. Dmg, Magic, Attack,..) with 1 Force Core and 1 Catalyst you need. (Daikatana, GreatSword for Crit Dmg as an example). But for lvl 2 you need 2 Force Cores and luck. (lvl 2: Amp, Rate, Luck, Hp Steal)
Chance of getting lvl 2 upgrade when 2 Force cores are used: 25%
Chance of getting lvl 1 upgrade when 2 Force Cores are used: 75%
So you see... like Trojan Lord said - very hard to get.
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