Voidrex sits at the very end of the Evomon dex, and Season 3 is the update that finally puts it within reach. Getting it is not a spawn hunt or a rare egg roll — it is a fixed story route through the Expedition Isles, capped by a pillar challenge that hands over the egg once you clear it.
Quick answer: Push story mode to the Altar of the Oath in Expedition Isles, speak with Lilian, clear the story bosses, then beat the Voidrex variants in Voidor’s Shadows of Souls pillar challenge to unlock the Voidrex egg.
Voidrex in Evomon: Dex #999, type and evolution line
Before committing hours to the route, it helps to know what you are actually chasing. Voidrex is a Dragon-type entry that sits outside the standard numbered dex run, and it shares its line with the NPC-facing Voidor.
- Dex number: #999, the final listed slot.
- Element: Dragon.
- Evolution line: Voidor (#998) into Voidrex.
- Strong against: Dragon.
- Weak to: Ice and Dragon.
You can open the Index at any point and look at the #999 entry to confirm the requirement text before you start. That entry is what points you toward story progress rather than any catchable encounter.
Where the route starts: Altar of the Oath in Expedition Isles
Season 3 reshaped the Island Map. Trade Plaza and the Seasonal Isles appear as their own destinations, and the Expedition Isles picked up fresh areas, including the Altar of the Oath. That altar is the anchor point for everything Voidrex-related.
Travel there and speak with Lilian. She gates the story chain that eventually opens the portal to Voidor, so there is no way to skip ahead to the pillar challenge.
Team setup for the Altar of the Oath story bosses
The story fights here are scripted puzzles more than stat checks, and they reward speed control plus the ability to strip defenses. A compact core handles all three encounters.
- Fluffastar with Intimidation and Linebreaker for defense pressure.
- Thor Lord for fast turn priority and clean finishing damage.
- Boltonia as a second high-burst attacker that moves early.
- Magmaxor and Clippexor in storage, swapped in for the specific fights below.
Keep your bench stocked rather than running one fixed five. Two of the three story fights are much easier when you bring a counter-pick instead of raw levels.
Altar of the Oath story fights and how to clear them
Twin bosses: the simultaneous defeat rule
The opening encounter puts two linked bosses on the field, and they have to go down on the same turn. Whichever one acts first blocks incoming damage, so hitting them one at a time simply resets your progress.
The working line is to spend the early turns lowering their defense, then release both ultimate attacks in the same round so the pair falls together.
Magmaxor and Snarewolf
The next fight pairs an enemy Magmaxor with Snarewolf. Bring your own Magmaxor and use it to delete Snarewolf as fast as possible, which removes the support half of the duo.
With Snarewolf gone, Thor Lord cleans up the enemy Magmaxor. The order matters far more than the damage numbers here.
The 3v4 trial: Goliath, Whisperine and Clippexor
The last story hurdle is an outnumbered fight against Goliath, Whisperine and Clippexor. Hone on your own Clippexor builds the attack you need, while Boltonia handles the damage thresholds that decide whether an enemy survives the turn.
Play it as a math problem. Set up first, then push each target past its threshold in a single burst instead of trading chip damage across four enemies.
Shadows of Souls: unlocking the Voidrex egg
Clearing the story chain opens a portal. Step through it to meet Voidor, the NPC who starts the Shadows of Souls pillar challenge.
Each pillar puts a Voidrex variant in front of you. Defeat them to finish the challenge, and the Voidrex egg becomes available. That egg is the payoff for the entire route — there is no alternate purchase or drop path to it.
You know it worked when the egg is handed over after the final pillar and the #999 Index entry stops showing its story requirement. If the entry still lists the requirement, a pillar is still standing.
Seasonal Isles bosses: Rillcrest and Budelora
The Seasonal Isles sit behind the World Select option on the Island Map, alongside Genesis Isles. Switching worlds there is how you reach the two element bosses added this season.
| Boss | Location | Element | Key mechanic |
|---|---|---|---|
| Rillcrest | Azure Pond | Water | Turn priority control |
| Budelora | Verdant Bower | Grass | Buffs and debuffs reverse |
Rillcrest is beaten by managing who moves first and using Linebreaker to cancel out its defenses before you commit to a big hit. Budelora is the trickier of the two, because its stat buffs and debuffs alternate and then flip each round, so a buff you apply now can work against you on the following turn. Time your setup to land on the round where it actually counts.
New Evomon added in Season 3
Five new creatures joined the roster alongside the seasonal content. You can pull up any of them in the Evomon Team menu to read the stat wheel and move list before deciding whether they earn a slot.
- Aurevix
- Rillcrest, the Azure Pond boss
- Cragmar
- Florajell, with Vortex Burst
- Budelora, with Calyx Seal
Season Pass tracks and seasonal rewards
Seasonal progress runs on a two-track Season Pass, split into a Free Pass and a Premium Pass. Rewards along the tracks include Apex Silver, Apex Medals and shiny eggs.
The quest menu feeds those tracks through Daily, Weekly and Challenge objectives, each awarding Season Pass EXP and Apex Silver. Clearing dailies while you run the boss route is the least wasteful way to level the pass.
Trade Plaza: player stalls, Prismatic Dyes and shiny eggs
Trade Plaza is the answer to the long-running question of whether players can exchange anything with each other. It works through player stalls, where you set up to sell and browse what others have listed. Prismatic Dyes, shiny eggs and consumable items are the goods that move most.
Travel there from the Island Map, open a stall to list your own items, or walk the rows and buy from other players. Anything you accept should happen entirely inside that in-game interface, with the item visible before you confirm.
Never hand over passwords, cookies, Robux, gift cards or off-platform payments for a promised trade. If someone pushes you into a Discord deal instead of a stall, walk away.
If you are checking whether a feature is live on your account rather than trusting a screenshot, open the game itself and read the current labels.
Work the route in that order and Season 3 stays manageable. The Altar of the Oath story chain is the only thing standing between you and the Voidrex egg, and the Seasonal Isles bosses, new creatures and Trade Plaza stalls are all still there once the dex is closed out.
