Although it's possible to defeat the Stellarite Devourer with almost any fleet of at least 40k Power, players can deal with the Guardian much earlier by specializing their ships to take it down.

Source: https://gamerant.com/stellaris-how-to-defeat-the-stellarite-devourer/

In fact, Warlock is the type who would stay Galactus's Herald just so he could make sure that the World Devourer destroyed as few worlds with life on them as possible.

Source: https://www.cbr.com/marvel-comics-best-characters-deserve-power-cosmic/