Welcome back, Chicks Gold readers! Are you ready for another battle with the forces of Necromancy? Well, buckle up because RS3's Osseous boss encounter has just landed! Fortunately for you, we've compiled all the information you need to successfully take down the Skeletal Rex in RS3 with ease! We'll discuss requirements, rewards, methods, and more to make sure you can navigate through the challenges to come. So, let's get into it!
Osseous RS3 Requirements
There are no requirements to worry about other than completing the Osseous Rex quest and having access to Anachronia. Once you have done so, you will be granted access to this encounter. This is a new action to be introduced with this Rex Matriarch in RS3, as the other bosses are readily available for battle. It is also worth noting the Osseous is stronger than her predecessors, proudly boasting almost double their health and some more damaging attacks and abilities.
Despite there being no direct requirements, there are a few skill suggestions to keep in mind that will certainly make the encounter easier. Let’s take a look:
- 99 Combat
- 99 Defense
- 73 Prayer
- 96 Herblore
- 86 Invention
Osseous RS3 Gear and Inventory
You’ll need to make sure you’re ready to deal some damage, and be ready to take it when you face off against this beast. Take a look below at the best stuff to carry you through this upcoming journey:
Gear
- Full Necro Gear (t70)
- Salve Amulet (e)
- Scripture of Jas
- Ring of Fortune
- Nexus (Ecto/Runes)
- Weaponry (t90)
Inventory
- Overloads
- Super Prayer Renewal
- Adren Pot
- Super Restore
- Vuln Bombs
- Note Paper
- Food
Osseous RS3 - Let the Battle Begin
To get things going, you'll first need to know how to access the RS3 Osseous encounter. You'll need to activate the Teleportation Device in the Spirit Grove, found directly east of the Anachronia base camp, and then run all the way to the east until you find yourself at the Rex Matriarch lair door. Alternatively, you can use a War's retreat attuned Boss Portal, which will teleport you directly to the lair door.
From here, in our Osseous walkthrough, you will need to go west of the Crumbled wall to where the original three Rex Matriarchs in RS3 reside. Then, click on the Osseous teleportation device in the eastern part of the lair, which will take you to the encounter.
Battling Osseous in RS3 - The Official Breakdown
The Battle against RS3 Osseous falls into the Dinosaurs Slayer assignment, with Laniakea as the Slayer Master. The creature is not poisonous but is labeled as aggressive, which is a given considering the battle we're here to partake in! In this segment of our Osseous guide in RS3, we will cover the offense and defense so you know exactly what to expect when the hits start coming. Let's take a look!
Osseous Offensive Stats
Attack
- Max Hit - ?
- Combat Level - 140
- Accuracy?
Ranged
- Max hit - ?
- Combat Level - 140
- Accuracy - ?
Magic
- Max Hit - 0
- Combat Level - 140
- Accuracy - ?
Necromancy
- Max Hit - 3,129
- Combat Level - ?
- Accuracy - ?
Osseous Defensive Stats
- Weakness - Necromancy
- Susceptible to - Necklace of Salamancy and Undead Slayer Effect
- Immunities - Poison and Stun
- Not Immune - Deflect and Stat Drain
Base Hit Chances
- Attack - 10
- Ranged - 10
- Magic - 10
- Necromancy - 100
For every time you slay Osseous in RS3, you will be granted the following:
- Multicombat XP - 17,500
- Slayer XP - 394
- Construction XP - 5,775
- Invention XP - 1,575
Osseous RS3 - Moves and Mechanics
Just like other RS3 bosses, Osseous will attack on a rotation; check out below the order in which these attacks will occur and what each of these moves will do.
Attack Rotation
- The Skeletal Rex will perform two Necromancy auto attacks (3 on repeat rotations). This attack will consist of green balls of energy that will attack the player.
- One Ranged auto attack will follow the two Necromancy. This mechanic will see spikes fired from the beast's tail at the player.
- Another automatic Necromancy attack will take place; this will repeat the first move, though only one will be used this time.
- RS3’s Osseous will then use ‘Minion Summon’, this is shown by the creature smashing her tail to the ground dealing heavy Melee damage. At which point, six skeletal baby dinosaurs appear and slowly move toward her. If they are allowed to reach her, they will heal between 5-10% of her current life points.
- One more Necromancy auto attack.
- One Ranged auto attack.
- One Necromancy auto attack.
- Osseous then performs ‘Minion Launch’ in which she swipes all minions with her tail, throwing them at the player one by one. They will then attack using Melee damage, which can stun the player.
- Two Necromancy auto attacks.
- ‘Osseous’ Roar’ is used which roots all players, and causes any living minions/baby dinosaurs to explore, inflicting 50% of their current life points in a small AoE.
- Two Necromancy auto attacks.
- Osseous will then use ‘Munch,’ which drags the player towards her and roots them in front of her. If you do not deal 5000 damage and break the roots, before she issues her high-damage chomp, you risk taking up to 6000 damage.
Defending Against Osseous in RS3
We know what the great beast is going to throw at us in this encounter, but the next big question to answer is how we protect ourselves. Below, we have broken down what needs to be done to take down RS3's Osseous; let's get into it!
When you enter the arena, immediately use your Necromancy abilities, activate Conjure Armies, activate Protect from Necromancy, and use Ghost Command. Following the first two auto Necromancy attacks, activate Protect from Range, then continue with your chosen Necromancy attack.
When the first mechanic, 'Minion Summon,' is used by Osseous in RS3, you'll need to take down the mini dinos before they reach the boss, or they will provide that 5-10% lifepoints heal. Wait until the minions are within Melee distance, and use your Zombie to blow them up by performing Command Putrid Zombie. If you don't manage to carry out this attack before Osseous finishes another round of auto attacks: one Necromancy, one Ranged, and then one final Necromancy, then she will perform a second tail swipe called 'Minion Launch' in which the minions will turn their attention to you, attacking and dealing additional damage. If this happens, wait until they're within Melee distance again in a cluster and then perform Command Putrid Zombie. Ideally, though, getting rid of them before this is best.
This mechanic will be followed by another two Necromancy auto attacks before Osseous uses 'Osseous Roar,' which will root you in place while the dino minions encroach closer and explode. Ensure that you destroy them before they reach their AoE to prevent damage.
Two more auto Necromancy attacks will then follow before Osseous uses her final mechanics, 'Munch,' in which the player is pulled close; you'll then be required to inflict 5000 damage to get free of the dinosaur's hold. So use something like Finger of Death, Volley of Souls, and Weapon Spec to help you break free. If you don't get free before the mechanic is powered up, you face taking a bite that hits with up to 6000 damage.
If you escape, continue the onslaught of attacks until you take down the great beast. If you take too long, however, the process will repeat, with the same mechanics and steps taken by Osseous going on a loop. Continue as you have until you manage to take her down.
RS3 Rewards - Osseous
Just like any other RS3 Boss battle, we're sure you'll be itching to know the Osseous drops in RS3. So, take a look below at what's up for grabs each time you slay this boney boss!
100% Drops
Each time you take on Osseous in RS3, you'll receive the following:
- Dinosaur Bones (2) - Price: 38,624
- Damaged Dinosaur Bones (4-6) - Price: 20,000-30,000
Main Drops (Common)
- Coins (69,027-120,000)
- Arbuck Seeds (2) - Price: 317,592
- Onyx Bolt Tips (17-23) - Price: 107,712-145,728
- Uncut Dragonstone (8-12) - Price: 37,592 - 56,388
- Watermelon Seeds (20-30) - Price: 20,340 - 30,510
- Large Spiky Rune Salvage (4-6) - Price: 118,208 - 177,312
- Medium Blunt Rune Salvage (4-8) - Price: 85,728 - 171,456
- White Berries (5) - Price: 14,160
- Dinosaur Bones (5) - Price: 88,000
- Super Necromancy (3) (5) - Price: 122,265
Main Drops (Uncommon)
- Damaged Dinosaur Bones (41-60) - Price: 205,000-300,000
Main Drops (Rare)
- Coins (500,000-700,000)
- Ancient Scale (1) - Price: 1,207,011
- Draconic Energy (1) - Price: 412,950
- Sirenic Scale (1) - Price: 13,907
Tertiary Drops
- (Uncommon) Sealed Clue Scroll (Hard) (1) - Price: One High-Level Alchemy
- (Rare) Occultist's Ring (1) - Price: 1,417,500
- (Very Rare) Jail Cell Key (1) - Price: 20,000,000
- (Very Rare) Calcified Heart (1) - Price: N/A
- (1/200) Heart of Berserker (1) - Price: 577,180
- (1/500) Savage Spear Tip (1) - Price: 2,152,737
- (1/500) Savage Spear Cap (1) - Price: 2,094,813
- (1/500) Savage Plume (1) - Price: 2,055,134
- (1/500) Savage Spear Shaft (1) - Price: 3,364,739
Universal Drops
Just like with almost all other monsters, Universal Drops occur when taking on Osseous in RS3. Take a look at what you could possibly gain from this encounter:
- (Rare) Key Token (1) - Price: N/A
- (1/10,000) Mimic Kill Token - Price: 84,314
Osseous RS3 Achievements
For all of your efforts in slaying the Skeletal Rex in RS3, you will unlock some achievements to make your ongoing adventures more enticing. So, let's check out what you can receive:
- Ossy Ossy Ossy! - Gained a collection of unique drops from the Osseous Boss.
- Rex Matriarchs - Defeat any of the four Matriarchs (X/1)
- I Came in Like a Rexing-Ball I - Defeat any of the four Matriarchs (X/5)
- I Came in Like a Rexing-Ball II - Defeat any of the four Matriarchs (X/10)
- I Came in Like a Rexing-Ball III - Defeat any of the four Matriarchs (X/25)
- I Came in Like a Rexing-Ball IV - Defeat any of the four Matriarchs (X/50)
- I Came in Like a Rexing-Ball V - Defeat any of the four Matriarchs (X/75)
- I Came in Like a Rexing-Ball VI - Defeat any of the four Matriarchs (X/100)
- Jailbreak - Release each of the baby dinosaurs from the jail cells with the Rex Matriarch lair.
Osseous RS3 FAQ
Just like every other Chicks Gold blog, we will below provide answers to some of the most frequently asked questions regarding our current topic. So, if you have any confusions about the Skeletal Rex in RS3, take a look below:
How to get to Osseous in RS3?
You will find this bony boss in the Rex Matriarch's lair in Orthen. To access this area, you can use the Teleportation Device in the Spirit Grove of Anachronia. You'll need 72 Magic and the standard spellbook to access and cast.
Are there any requirements for this boss encounter?
You'll need to have completed the Osseous Rex quest to enter into this battle. While this is the only essential for this adventure, you should take into consideration the gear you take with you. Necromancy poses a threat to Osseous in RS3, while she is relatively resistant to the other three combat methods. So ensure you are well-equipped with suitable weapons and armor before you enter the arena.
Osseous RS3 - Coming to a Close
Another tiresome adventure in the bag, but certainly a rewarding one at that! Now, why not take some time to sit back, relax and enjoy your newfound success? When you're ready for your next adventure, dive into our blog section and find your next guide to success; we have some excellent RS3 reads, as well as an abundance of other games for when you need a change of scenery. You can also replenish any lost gold and items at Chicks Gold! Check out our pages dedicated to RS3 attributes, and get ready for the next big endeavor!
