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The Fallen Empires are overwhelmingly powerful. Luckily I have 4 vassal empires to assist!

According to the Stellaris wiki:

Fallen Empires are large and extremely powerful empires that have become old and stagnant with their societies grown inward over the ages.[1] Their empire is fully developed at the start of the game. Due to their large and powerful fleets, they should not be provoked until your fleet strength and technology is similar. At normal difficulty, their approximate fleet power is 40k if not significantly greater, depending on the size of their empire. Fallen Empires use a unique ship and station art style which is exclusive to them, which distinguishes them from ships of ordinary empires; there are three visual variants of this style but they are otherwise identical in terms of ship configurations.

Fallen Empires can only normally be controlled by the AI, though Console commands allow a human player to switch to them in the course of a game.

It is impossible to vassalize a Fallen Empire, and they are rarely interested in peace offers once a war has begun. When engaging in a conflict with them, it is essential that an empire be fully prepared to deal with the consequences and be prepared to carry through on any demands made. Whilst they cannot be vassalized, a Fallen Empire's planets can be annexed (via the Cede option) or turned into a new state (using the Liberate goal), creating a new empire that may then be taken in as a vassal - and is highly likely to agree to such an offer, due to sharing the liberator's ethos choices along with positive modifiers from automatically-established non-aggression agreements and guarantees of independence.