As a certified merperson who grew up on the coast, the folksy mariner vibes are *chef's kiss*. The Coral Blade is a great example how to make an imaginative magic item in TTRPGs that actually feels magical and not like some video game loot.
Cheers pal. Nothing like a sea breeze and a rocky cliff to make you think 'surely a kraken lives down there somewhere?' As a group we normally play very low magic games, hence the steer away from classic magical loot.
