Lost Rex
Variant
Overview
The Lost Rex is a large carnivorous variant creature. It possesses the ability to be carried by certain larger creatures, making it useful for strategic deployment. Its primary utility comes from its capacity to be airlifted by Tusoteuthis, enabling rapid transport across difficult terrain or into combat zones where direct travel is dangerous.
This creature is typically used in coordinated assaults or for targeted raids, leveraging its carnivore strength and mobility when paired with a flying carrier.
Spawn Locations
Lost Rex does not currently spawn on any ARK: Survival Ascended map, or spawn data is not yet available.
Taming
The Lost Rex cannot be tamed.
Lost Rex is not tamable.
Drops & Harvest Resources
Killing the Lost Rex yields Tyrannosaurus Arm, Rex Bone Helmet, Hide, Raw Meat, and Raw Prime Meat. The Hatchet yields the most Hide, while the Pick is best for Raw Meat. Dinos specialized for Prime harvest are most efficient for Raw Prime Meat.
| Resource |  Pick |  Hatchet |
|---|---|---|
| 40%~21~17 hits | 60%~32~13 hits | |
| 60%~24~17 hits | 40%~16~13 hits | |
| 3%~1~17 hits | 2%~1~13 hits | |
| - | - | |
Rex Bone HelmetDrop | - | - |
Estimates based on game-extracted data (weights, quantities, harvest multipliers, damage type chains). Each harvest event independently rolls each resource - higher weight = higher drop chance. Actual yields vary with RNG.
Damage Resistances
The Lost Rex has a significant vulnerability to spike walls, taking +400% damage, making it highly susceptible to defensive perimeters using these structures. It also takes +120% damage from general instant damage sources and +55% from metal melee attacks. Conversely, it is completely immune to mining drill damage, reducing that damage source by -100%. It resists piercing melee attacks and piercing projectile impacts by -50%, including those from double-dino damage sources.
Kill XP
Wild Kill (1.25×)30 base × 15.9 level × 4 × 1.25× wild kill × 1× server
Server Settings(Game.ini)
Official servers use non-1× defaults; the values above already reflect official rates.
Saddle Crafting XP
Base × 1× quality × 4 × 1× server
| Stat | Base (Lv.1) | Wild +/Lv | Tamed +/Lv |
|---|---|---|---|
 Health | 1100.0 | +220.00 | +4.00% |
 Stamina | 420.0 | +42.00 | +2.00% |
 Torpidity | 1550.0 | +93.00 | +0.00% |
 Oxygen | 150.0 | +15.00 | +2.00% |
 Food | 3000.0 | +300.00 | +2.00% |
 Weight | 500.0 | +10.00 | +0.80% |
 Melee Damage Multiplier | 100.0% | +5.00% | +10.00% |
 Speed Multiplier | 100.0% | +0.00% | +1.00% |
Hitbox Multipliers
The head of the Lost Rex has a damage multiplier of 1.5x, making headshots more effective when attempting to knock it out or defeat it in combat.
Can Damage
Can break Thatch and Wood. Build at least in Stone.
Thatch
Wood
Stone
Metal
Tek| Attack | Base | Thatch | Wood | Stone | Metal | Tek |
|---|---|---|---|---|---|---|
| BiteCarnivore Rex | 62 | 341.0 | 186.0 | — | — | — |
| Bite (AI)Carnivore Rex | 62 | 341.0 | 186.0 | — | — | — |
Numbers reflect base melee at level 1, 100% TE, no imprint. The damage calculator lets you scale by melee %, server multipliers, and pick a specific structure for exact hit counts.
Tools & Guides
Lost Rex Tips & Tricks
The Lost Rex can be stunned by triggering its Roar ability, which activates a 4-second stun on enemies within a 75-degree cone. This ability has a 60-second cooldown.
It is highly vulnerable to spike walls, which exploit a +400% damage weakness, making them extremely effective in base defense.
The creature is immune to mining drill damage, reducing it by -100%, allowing it to safely bypass automated mining systems.
It can be immobilized and carried by Tusoteuthis, enabling unique aerial deployment strategies.
This page details the Lost Rex's stats, taming requirements, breeding mechanics, harvest specifications, and combat data. For further assistance, refer to the taming calculator, breeding calculator, and spawn map for additional insights.