How to Play SERESGENUS: EPHEMERALITY With Friends (Co-op Guide)

Quick answer

Yes. SERESGENUS: EPHEMERALITY can be played alone or in co-op, so you can bring friends along. As a party you explore, gather resources, build bases and fight your way through the worlds together. Keep the party to four players or fewer — runs with more than four players earn no rewards.

• Choose co-op when you start a game and invite the friends you want in your party.
• Each world has a powerful regional boss you must defeat to move forward, and fighting these bosses with a party is the recommended preparation.
• The Bigger Server Size game pass (R$250) lets the host run lobbies of up to 8 hunters, but runs above 4 players still earn no rewards.

Co-op is one of the headline features of SERESGENUS: EPHEMERALITY. The voxel roguelike adventure by Omelette Snake on Roblox officially supports playing alone or with friends, and this page covers how to start a run with friends, what a party can actually do together, and the party-size rules that decide whether your runs earn rewards.

How to start a run with friends

Co-op uses the same start-up steps as any run — the only difference is the mode you choose:

1. Choose solo play or co-op, and invite your friends. Pick co-op if you want to play as a party, then invite the friends who are joining you.
2. Pick a class to set your playstyle. Class choice also shapes how you fight, and the same guide advises choosing a class early. If you are torn between options, the class chooser guide walks through the decision.

Getting the group into one server is not the hard part: the Roblox game details report a server size of 50 players, as recorded on November 7, 2026 (server settings can change). What actually limits a co-op party is the reward rule below.

What you can do together as a party

Co-op does not swap in a different game — the party plays the full loop together:

• Explore the six worlds. The adventure travels across six unique voxel worlds, each with its own enemies, resources, secrets and a powerful boss to defeat. The worlds guide covers the route.
• Gather resources. The party gathers resources from the worlds it explores. The materials gathering guide explains how.
• Build bases. Building is a party activity too — the group can construct bases together between fights and expeditions. The base building guide covers the details.
• Fight through the worlds. Enemies and bosses are handled as a party, pushing through each world's threats together.

Keep parties to four players if you want rewards

The most important co-op rule for a group of friends concerns size. According to a third-party guide, parties should stay at four players or fewer, because runs with more than four players earn no rewards. The report comes from a third-party site rather than the official game description, and it may change during the beta — but as things stand, a run with five or more players earns no rewards.

If you want a bigger group anyway, there is a pass for that. The Bigger Server Size game pass (R$250, as listed by a third-party site on November 7, 2026; prices can change) lets its buyer host lobbies of up to 8 hunters, and only the host needs to own it. The catch is the reward rule above: even in a hosted lobby, runs above 4 players earn no rewards. The pass raises the size of the lobby you can host, not the size of a reward-earning run.

For the full pass lineup, see the game passes page.

Boss fights are where a party shines

Each of the six worlds has a powerful regional boss, and defeating that boss is how you move forward. One third-party guide recommends preparing for these fights by gathering resources, crafting better gear and fighting with a party if you can — which makes bosses the clearest spot where co-op pays off. Individual fight mechanics are their own topic: see the co-op boss fights page or the general bosses guide.

Expect a few beta bugs along the way

The official Roblox listing labels the game [Open-BETA], and the developer warns that the game is still in beta, so bugs should be expected. That is worth remembering before you plan a long run with friends, and it is also why the third-party party-size rule above could shift during the beta.

Playing solo instead

Nothing about the game requires a party. The same loop — exploring, gathering, building and fighting through the six worlds — also works alone, and the solo guide covers that route. New players starting either way can begin with the beginner guide.