How should I level up mana spells in Grandia 1?
So I started playing Grandia last Saturday because I wanted to play another 2d 32-bit RPG(the first one was Lunar SSSC) and I was thinking about this one for a while. I chose to play the Saturn version too. After several hours of playing I found out about these Mana egg things and gave Sue 2 of them, Justin 2, and luckily Fina already came with a fire spell so I just gave her one egg. But these spell things are confusing me.
I spent a while last night playing through Dom Ruins and managed to level up their spells quite a bit, but it took a while and I like using the regular combo/critical attacks too. Is this like the esper system in FFVI? And I know there is another egg in Dom ruins but I do not know what to do when I find that one. And I also know that Sue leaves later in the game so I do not know how to go about with her magic. Here is what I have now:
Justin : Fire and Wind magic
Sue: Wind and Water magic
Fina: Fire and Earth magic
I do not whether I should just keep grinding or just leave those element things behind, because my characters are already plowing through most things anyway at the time. But I do not know, maybe the game gets harder later.