The Instabridge is a powerful explosive. When used, it instantly explodes at the cursor's position, creating a bridge of Wood Platforms that stretches from the left side of the world to the right side. Furthermore, it will clear 10 rows of blocks above the bridge.
Similarly, the Instabridge will only destroy Chests if they are empty.
If you use three to four instabridges in the underworld right above each other, a very effective Wall of Flesh arena is made. This strategy is extremely useful in Eternity Mode, as you get the perfect arena, without having to spend hours and hours of building and mining.