I think I am too far into the game to get it now. But the last gift mentions something about "vitality" I think? I am not sure if there was another spell, or some stat gains.
Another thing I noticed was that speed buff/debuff appears to last even after battles or when I die in battle and respawn at the last save. The star in the upper left corner that determines double turns also carries over between saves/respawns.
I've made it so that talking to the statue unlocks the Dark Storm skill if the needed Master count has been reached and you talk to the statue -- doesn't matter what it says. It's a skill for Rok, Slith and Karas. I'm not sure if it's still all that useful if you're nearing the end of the game.
Did another quick update adressing the speed debuff and the bonus turn star. Heavy stops after battles, but Light doesn't. Loading the game resets the light/heavy status now. The bonus turn star also saves its status now.
I can't get the Dark Storm skill added (tried all 3 dialogue options with the Wyrm Altar). But like you said, probably not all that useful given where I am.
I will let you know if I see anymore bugs with regards to the speed debuff and bonus turn.
EDIT: happy to report that the speed debuff continuing after battle is gone.
