just gonna add on that this class isn't available in nutaku aigis yet so most players wouldn't know what they do. so refer to http://harem-battle.club/millennium-...-1-2015-a.html under advanced units.

Alchemist = ranged unit that halves def
anyway rather niche unit. just checked gcwiki and I think Charl is probably more useful in terms of doing what her class is supposed to do while Corinne's better as an alchemist that also attacks. but in the end, neither really matters to me.