Grand Clockwork

The Grand Clockwork is a structure that spawns in the world. It will usually spawn in the Forest, but if there is no forest available, then the tower will spawn in any biome. It appears as a very large clock tower. (The reason some parts of the picture look strange is because i'm playing with my mod and Ancients Awakened at the same time.)

Information
The Grand Clockwork houses little to no things in Pre-Hard mode except for the Salten Altar, which can be used for many things and the Magic Clock, a NPC which must be destroyed with a Teanite Pickhammer ( 300% pickaxe power) to start the Time Invasion, and that can only be crafted in War Mode. In hardmode, Time Elementals and Storm Smashers will begin to spawn, and sometimes drop Souls Of Time. Post-Plantera, True Time Elementals will rarely spawn as a boss and post-Moon Lord, Mysterious Objects and Broken Machines will spawn. Once the Magic Clock is broken any Time-related creatures will no longer spawn. The blocks of the Grand Clockwork however, are only destructible with pickaxes that have over 1000% pickaxe power, only obtainable in Endgame War Mode. The Magic Clock will spawn back in within 4 in-game days once it is broken. It can only truly be broken with again, pickaxes that have over 1000% pickaxe power. However the Magic Clock will not drop, and the time invasion will not start, so it is advised to not do this.