Gentleman's Longblade is a post-Superancient tier sword that is the EX variant of Gentleman's Rapier. It shoots a swarm of spooky dapper top hats in an arc at a quick rate. Using left click swings the blade like normal and right click thrusts the blade forward like a usual rapier and a shortsword.
The weapon shooting hats is a reference to the dedicatee Tied, who is one of developers of Mod of Redemption along with Hallam, which both share a similar avatar in Discord with both wearing classy clothes.
This is also the case with their developer sets, as both have a similar classy appearance with only difference being the color of outfit.
This weapon has an unique rarity unlike most other weapons, but since this is an Expert Mode exclusive weapon, its rarity is rainbow for consistency purposes.
Its actual rarity is a darker shade of green, which is also the same color his weapon and dev set has.