Lost Rex
Lost Rex Overview
In ARK: Survival Ascended, Lost Rex occupies the wild niche - roams the ARK as a wild, untamable creature. Lost Rex cannot be tamed through conventional methods and is encountered with 500 base Weight, providing an enormous weight pool. It gives live birth after a gestation period, with offspring maturing at a glacially slow pace - plan for a multi-day commitment. Survivors lean on it to gather Hide, Raw Meat, Raw Prime Meat at much higher rates than hand tools. Knowing where it spawns and how it behaves matters more than any taming plan for Lost Rex.
Spawn Locations
Lost Rex does not currently spawn on any ARK: Survival Ascended map, or spawn data is not yet available.
Taming
Lost Rex is not tamable.
Breeding
Open Calculator →Quick Info
XP Calculator
Full Calculator→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
Drops & Harvest Resources
Harvesting a dead Lost Rex yields Hide, Raw Meat, Raw Prime Meat. The corpse has 520 harvest health, allowing multiple hits before it's fully depleted.
Different tools yield different quantities - check the table below to pick the right tool for the resource you need. Generally, a Pick favors meat while a Hatchet favors hide and secondary materials.
| 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 14 damage type modifiers that affect incoming damage. With 7 resistances and 6 weaknesses, its biggest vulnerability takes +400% extra damage - exploit that for faster kills. See the full breakdown in the table below. Values under 100% indicate resistance, above 100% indicate weakness.
Base Stats
Full Stats→| 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
Aiming matters - the Lost Rex has 1 hitbox region with distinct damage modifiers. Hit the Head (1.5x multiplier) for the highest damage per shot.
Can Damage
Open damage calculator →The Lost Rex can damage: Thatch, Wood. It can break through Thatch and Wood, so upgrade to Stone at minimum for protection.
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
Browse survivor-submitted tips and strategies for the Lost Rex.
This page is your complete guide to the Lost Rex in ARK: Survival Ascended. Below you'll find a quick overview of its base stats, taming method, breeding data, and harvest capabilities - plus links to dedicated tools like the taming calculator, breeding calculator, and interactive spawn map.
The Lost Rex starts with 1,100 base Health, 100% base Melee Damage, 500 base Weight. These base values scale with each wild and tamed level-up, so check the taming calculator to see exactly what stats you can expect at different levels.
The Lost Rex gives live birth after a gestation period. Babies mature in 3 days and 20 hours. Check the breeding calculator for detailed imprint schedules and raising costs.
Once tamed, the Lost Rex can harvest Hide, Raw Meat, Raw Prime Meat. Visit the information tab for the full harvest table with quantities and efficiency data.