Invasion of The Shadows

Get ready, because a new update, the LARGEST one in the entire history of IoTS, has arrived!

What's new:

-The Sound Update, which was mentioned back in 1.3.5, was finally implemented! Bosses now have unique themes, Overworld (+ Shadow Domain, Echoing Past, Heaven, Outerlands and the list goes on) have ambients, and so much more!

-Remade Shadow Lord, Vainful and Glorious (4th Boss), Master Cosmos (SUPERBOSS), and revamped Void Damage mechanic.

-Two new Voidful Shadows: Voidful Television, who can be helpful, agressive or even whimsical, and Horrorgamation, a walking nuclear bio-warhead waiting for the right moment to self-combust.

-Strengthened decoys of Lesser Shadow and Shadow Kamikaze.

-new high-tech gadgets: Progression Tracker and Voidful Locator!

-Two tiers of rocketry.

-Interplanetary exploration - jump between planets in search for Seven Cores.

-A new caste of Shadows - Cosmic Shadows. They're more dangerous than usual Shadows, but they can be met only after defeating the 4th Boss.

-Textures of Moon were replaced.

-new music for main menu.

-Chapter 2 of Progression - after defeating Vaingful and Glorious, you now will have to deal with Master Cosmos and Cosmic Shadows.

-Innerlanders - a new faction that is also part of Shadow Universe. They're hostile aliens that will try to take over your world, landing on Overworld with the help of vessels.

-A new tier of tools, gear and machinery that uses Innerlander Scrap as a material for new purposes. You can even craft a Hovercraft.

-Bosses of Outerlands and Innerlands. Outerlands Bosses are not about brute force, some Cores may be acquired in different ways.

-Reorganized creative tabs, now there are much more of them!

-New game rules, which allow to configure some features. One of them is Iron Will Mode - can you complete the mod with only 10 lives in total?

-Console commands (by now, they're enabled only when cheats are enabled, beacuse they're progression-changing commands).

-Overhauled World Progression, with new World Phases and a new system of gaining and losing corruption points.

Spoiler

Secrets:

-The beginning of the 3rd chapter - after Master Cosmos gets banished, go to The Void. But what'll meet you is its defeated version.

-Reach The Skybox and activate the bell to signify the downfall of Shadow Universe.

-Find The Protector and receive help in banishing anomalies which have awakened in Abstract Worlds as a result of Shadows' sabotage.

-Two Abstract Worlds - Hidden Earth and False Moon, with two anomalies - Micronizator and Moon Agent.

Reanimated Disco Shadow (thanks to Tendrails)