The Magic menu shows spells and amount of MP each spell cost. New spells are unlocked with character levels. 'Mappa' shows a minimap for a while, Medi recovers HP.
Talking to monsters can enrage them, convince them to flee (taking XP and money with them), or to join your party. This is easier during the new moon, if there is only 1 monster left, and with the WIS stat.
'Megami Tensei' translates as 'Godess Reincarnation'.
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