A horse of course
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Do you get any tangible rewards for Libra of Souls, outside of cheevos? I pretty much jumped into online play from the get-go.
It unlocks two extra missions in Soul Chronicle for Raphael and Zasalamel, though only's Raphael's is an actual fight. You can also convert your gold to Soul Points in one of the shops. Though if you're farming SP for whatever reason, it's probably faster just to unlock Inferno and speed through Arcade.