Steal An Egg Alien Tidal Surge: The Flooded Biome, Prismare and How I'd Farm It

On this page

1. What the official notes say
2. The five Tidal Surge pets
3. How the flood works (as players have measured it)
4. The math, honestly
5. The guaranteed route: Fishing Milestones
6. My Tidal Surge plan
7. FAQ
8. Sources

🗓️ Last updated: 10 November 2026

Three days into Update 12, the Tidal Surge is the part of the Alien Biome people ask me about most. It’s also the part with the most made-up numbers floating around. So this page separates what the developers said, what trackers have measured, and what I’d actually do.

What the official notes say

The Update 12 notes the developers posted on the Steal An Egg Discord describe it like this:

• Every night, there's a chance for a Tidal Surge in the Alien Biome.
• When it hits, the entire biome floods and turns into an underwater version of itself.
• There are 5 exclusive pets to unlock during the surge.

That’s it. No percentage, no timer, no egg count. Anything more specific comes from players measuring it in game.

The five Tidal Surge pets

Two separate fan trackers list the same five pets with the same base incomes. The chances in the last column are reported from in-game data by one tracker, and another still marks them as unverified, so read them as “best current info,” not gospel.

Pet	Rarity	Base income	Reported chance per flooded egg
Jellynova	Cosmic	$100M/s	73%
Flarefish	Cosmic	$300M/s	20%
Tideler	Secret	$2.8B/s	5%
Abyssjaw	Eternal	$5B/s	1.9%
Prismare	Divine	$20B/s	0.1%

Swipe the table sideways →

For context, Prismare’s $20B/s base is the second-highest in the whole Alien set. Only Xenorath, the fusion of Obsidian Rex and the Nebuloth Kraken, is listed higher. My full Alien pet table is in my Update 12 guide.

How the flood works (as players have measured it)

Here’s the reported loop, again from in-game tracking rather than official notes:

• Chance: about 10% per in-game night, according to one tracker.
• Length: the flood lasts until the next egg reset, roughly 5 minutes.
• Eggs: flooded eggs spawn across the biome while it's underwater.
• Fishing: if you're fishing in the Alien Biome, the "Alien egg" catch becomes a flooded egg during the surge.
• Announcements: server chat calls out rare spawns, like "A Divine Prismare Egg spawned in Alien Tidal Surge."

The math, honestly

If the reported numbers are right, Prismare is a 1-in-1,000 roll per flooded egg, inside an event that only shows up on about 1 night in 10. That’s not a grind. That’s a lottery with a snorkel.

Abyssjaw is better at 1.9%, or roughly 1 in 53 flooded eggs. Tideler at 5% is about 1 in 20. Those are the realistic surge targets for most players.

The guaranteed route: Fishing Milestones

Here’s the part I love. Two Tidal Surge pets are reported as Fishing Milestones rewards, so you can earn them with time instead of luck:

Fact	Detail
Jellynova	Reported at 1,500 fish
Abyssjaw Egg	Comes with the Kraken Rod at 5,000 fish
Where to fish	Alien Biome and the Alien Lagoon
Speed needed	250B for the Alien Biome eggs and the Ferryman

Your Milestones menu is the real source of truth, so check it before you plan a long session. My Alien Lagoon fishing guide covers rods, Void Pearls and the Cosmic Eclipse at :25 and :55.

My Tidal Surge plan

1. Hit 250B Speed first. Without it, you can watch the flood but can't steal from it. My Speed guide helps.
2. Fish in the Alien Biome at night. Every fish counts toward milestones, and your egg catches turn into flooded eggs if a surge hits.
3. When it floods, go for eggs fast. You've got roughly one egg reset before it drains.
4. Don't chase Prismare on purpose. Aim for Tideler and Abyssjaw, and let Prismare be a surprise.
5. Work toward 1,500 and 5,000 fish for the guaranteed Jellynova and Abyssjaw.

Will it still be here next week?

The official “New Alien Biome” listing ends Sat 14 Nov: 11am PT / 2pm ET / 7pm GMT / 6am AEDT (Sun 15 Nov) / 8am NZDT (Sun 15 Nov). A listing ending isn’t the same as content being removed, and nothing in the notes says the surge is limited.

My guess is it stays as part of the biome, the way past biomes have stayed after their listings ended. That’s my read, not a promise.

FAQ

Sources

• Roblox: Steal An Egg “New Alien Biome” event listing
• Sportskeeda: Steal An Egg Update 12 patch notes (from the official Discord)
• eggPing: Alien Tidal Surge in-game tracking
• STEAL EGG: Update 12 Alien Biome

Last checked: 10 November 2026 (NZDT). Image credits: JuJuBo TV, ViewSIM and Vindooly on YouTube.

kikomii is a fan site and isn’t affiliated with Roblox or the Steal An Egg developers.