It's me again hehe...
Spoilers
Man....I thought if I win skam'mer I could save Mul... Now I feel more sad ๐ฅฒ
and yes I'm replay the game and do all the fights
Hehe...
I'm sorry, but Skam'mer has the ultimate superpower: money xD
But well, you do get his wand, which is actually a really good weapon for Lianna. It doesn't deal as much dmg as the Spirit Staff, but it makes all her attacks super fast (and, as consequence of how the engine works, it also makes it really easy to escape from fights, since the odds are based on your team's speed compared to the enemies' lol)
Ohhhh! You've beaten the game's ultimate challenge now, and I (probably) won't make a harder boss later so... congratulations! xD
If you want some lore about his sword (and haven't already done so), you can get the mithril orb from Shida's second quest, talk to the Fire Spirit and then to chief Eino. That may or may not be foreshadowing for the next game ;)