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Duplication is a skill for Arumat, used from the main menu. It takes 280 SP to max it out to level 10, and that's the first thing to do.
So, how does it work? Simple: use it like you would use "Ocarina" from the main menu, and select the item you want to duplicate. Each duplication costs some Magical Clay (from 1 to 11 max, at level 10), and most items can be duplicated. You need to have the item to duplicate in your inventory; if it's equipped on someone, it can't be duplicated.
Magical Clay is farmed easily by stealing it from the Bone Knight enemies on the first floors of the Cave of the Seven Stars, and it's a rather quick process too. There are some things that you can make to improve the steal rate, and for reasons that we will soon explain you will use Myuria to steal instead of Meracle.
Level up with Myuria against the Metal Scumbags until she's at least in the 70s, then start stealing Magical Clay on, say, level B1 (there is a Bone Knight group Northwest or Southwest of the elevator). In order to steal efficiently, kill every other enemy on the field around the Bone Knights (there should be only one Gust Hornet group), then engage the Bone Knight fight. Try to strike a pre-emptive attack, so you can avoid bad surprises of Bone Knights mixed with Gust Hornets; it shouldn't be hard, since the Bone Knights don't chase after you on the field.
In the fight, use the LS_Forward+A attack ("close-quarters attack") in melee range while controlling Myuria as Leader: this attack hits multiple times (twice) on its own, and with all those "Adds one hit chance per attack" this means that she will steal very frequently. The primary reason why Meracle wouldn't work good is that Meracle kicks away the enemies when she attempts to steal, and this kills any plan of doing things quickly.
After stealing from every enemy, flee from the battle (set Elusion on Sarah/Lymle to speed this up), so you can engage the Bone Knight group again
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