Zyraphim
The Destroyer
Before we get into it, there are changes that should first be made to the components of the Mercury Boots.
Dunerider's effect should work on sandstone bricks, slabs, and the rest of the blocks made of sand.
As it stands, Flurry Boots are nothing more than a reskin of Hermes. They should receive the same treatment as Dunerider Boots and give a speed boost on snow, ice, and their bricks.
The fact Sailfish Boots are used in Amphibian Boots sets them slightly apart from Flurry, but they are still essentially a Hermes reskin. They should be reworked to give a speed boost when running on the surface of liquids (while using Water Walking Potions / Boots; Sailfish wouldn't grant water walking per se) and negate the horizontal slowness when submerged similarly to the Trident.
With that out the way, we can start the main suggestion.
⟜⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⊸ 🛆 ⟜⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⊸
⦉ Mercury Boots ⦊
'Gotta go fast!'
Lightning Boots + Dunerider Boots + Flurry Boots + Sailfish Boots @ Tinkerer's Workshop
The Mercury Boots combine the effects of all their components to become the ultimate speed accessory. They increase the player's base speed to 38 mph on regular blocks and to 54 mph on all sand blocks, snow / ice blocks, and liquids, as well as negate the slowness in water. While Amphibian Boots sacrifice some horizontal speed for vertical movement, Mercury Boots sacrifice the flight of the Lightning Boots for extra horizontal speed.
⟜⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⊸ 🛆 ⟜⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⊸
⦉ Mercury Boots ⦊
'Gotta go fast!'
Lightning Boots + Dunerider Boots + Flurry Boots + Sailfish Boots @ Tinkerer's Workshop
The Mercury Boots combine the effects of all their components to become the ultimate speed accessory. They increase the player's base speed to 38 mph on regular blocks and to 54 mph on all sand blocks, snow / ice blocks, and liquids, as well as negate the slowness in water. While Amphibian Boots sacrifice some horizontal speed for vertical movement, Mercury Boots sacrifice the flight of the Lightning Boots for extra horizontal speed.
⟜⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⊸ 🛆 ⟜⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⊸