You get these by combining Hermes Boots from normal chests with Rocket Boots which you can buy off of the Goblin Tinkerer after you beat the Goblin Invasion into Spectre Boots. And then you'll need the Aglet which is contained within normal chests along with the Anklet of the Wind which can only be found in Jungle Shrines. Then you combine them all together into Lightning Boots and then you'll just need Ice Skates to make the glorious Frostspark Boots!
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The Frostspark Boots are a craftable accessory that allows super-fast running, flight and extra...