[quote=@BCTheEntity]
[@LokiLeo789][@Ira] Yeaaaah, I feel like the Seastone would kind of just... stab through the protection of Raijin Mode. Or rather... well, let's just see what the [url=http://onepiece.wikia.com/wiki/Seastone]wiki page[/url] has to say.

<Snipped quote>

...so, it seems to me that activating Super Spark Human has, ironically, reduced Rayne's protection against Seastone compared to his normal state of forcefieldedness, since the Seastone attack wouldn't necessarily have been able to break through the force field without its user having sufficient strength to pierce the force field first. Once it hits your skin, it works immediately. So... nice job breaking it, golden super mode?
[/quote]

The edges of the blade are wrapped in seastone. The weapon itself is obsidian . I just never revealed. Reinforced with Marxo's haki and full use of his power(since he isn't in contact with the seastone himself) 

I'd suggest you take a note from piccolo and DODGE.