This is a mod that adds a raid-type dungeon in the ancient cities making use of the giant 'portal' in the center.
To activate the portal here, you need to clear it of its vegetation and right click it with an Ancient Flame. This can be acquired from ancient city chests or by opening special imports, which are obtained by trading with the new villager after beating the dungeon.
It also adds three new ores. cobalt, mythril, and titanium. These can be found deep underground with cobalt being the most common and titanium being the most rare. However, these can only be mined with cobalt or better tools. In addition to this, there is a new tree type, only found on mountains (This uses the forge mountain tag, so it should work with terrain mods but it isn't tested). These logs can be crafted into the Metawood Infuser, which is the workplace for the previously mentioned villager.
"How am I supposed to get the ores if I need that material's pickaxe?"
Easy. You can find what you need in end city chests, (or much, much more rarely in bastion treasure chests).
No files available for download.
