Originally posted by Capcom:

On Friday, December 21 at 00:00 a.m. UTC, we will release Title Update 5, which includes some bug fixes. Details will follow later.

Major New Content:
- Behemoth, a powerful beast from another world. Its large horns and muscular frame defy nature.
- Collaboration equipment and Palico armor based on the dragon-slaying Dragoons from
　　 Final Fantasy XIV.
　・New weapon: Insect Glaive "Gae Bolg" + Kinsect "Dragon Soul."
　・New armor: Drachen series.
　・New Palico armor: Moogle α series.
- New endemic life: Cactuar.
- Various other features unique to this collaboration.
Talk to the Serious Handler in Astera after completing the game (HR 16 or higher)
to take on a special assignment.
The special assignment in this title update will be available indefinitely.

Bug Fixes:
- Various bug fixes are planned for this update.

Collaboration Info:
- Rathalos, King of the Skies, arrives in Eorzea! Hunters, become like Warriors of Light!
Rathalos and Felynes, mainstays of the Monster Hunter series, are coming to the world of
Final Fantasy XIV!
- For more details, see the official website:
　 https://na.finalfantasyxiv.com/lodestone/special/monsterhunter/
　 (You can change the language at the top right of the screen)

Originally posted by Capcom:

From Friday, December 14 00:00 a.m. to Thursday, December 27 23:59 UTC,
one of the most dangerous arch-tempered elder dragons arrives on Steam!

- Take on the Event Quest "The Deathly Quiet Curtain" to slay an Arch-tempered Vaal Hazak!
　・Arch-tempered monsters can be distinguished from their normal counterparts by
　 their slight metallic gleam.
　・When taking on this Event Quest, the color of the frame around the monster icon
　 will be different than usual, so keep an eye out!
　・You need to be Hunter Rank (HR) 50 or higher to take on this quest.
　・Please note that the availability of this quest is subject to change without prior notice.

- Craftable equipment:
　・Vaal Hazak γ armor series
　・Death Stench Layered Armor

- Known bugs:
We have confirmed a bug that prevents you from selling items on the rewards screen after completing the Kulve Taroth Siege quest, if the item box contains the maximum number of
that item (9999).
　・This bug prevents you from individually selecting and selling the item in question,
　 　and from jumping from the item icon to the Sell All option with the cursor.
　・This only occurs when you possess the maximum number of an item.

Before going out on the Kulve Taroth Siege quest, please make sure you do not possess (close to) the maximum number of any of the reward items.
We apologize for the inconvenience.

Originally posted by Capcom:

On Thursday, November 22 at 00:00 a.m. UTC, we released Title Update 4,
which includes some bug fixes.

Major New Content:
- Added Lunastra, a rare female Elder Dragon that litters the air with hot blue dust.
There are reports of her traveling with her mate, Teostra.
Her materials can be used to create new weapons, a unique armor set, and Palico armor.
After completing the game (at HR 16 or higher), talk to the Huntsman in Astera to start the event.

- Added a new specialized tool: the Temporal Mantle.
This garment nullifies damage from powerful attacks by automatically evading.


Major Additions and Changes:
- Added "DOF (Depth of Field)" to the Advanced Graphics Settings.
This feature allows you to enable/disable the functionality to adjust focus by changing the camera distance during scenes where you control your character (outside of cutscenes).

- Added "Vignette Effects" to the Advanced Graphics Settings.
This feature allows you to enable/disable shading of screen edges by adjusting the brightness between the center and peripheral areas during scenes where you control your character
(outside of cutscenes).

- Added a preset function to the Keyboard Settings, allowing you to save changes you made to the key configuration. Any presets you store to your save data will be accessible to all of your characters. There are three categories: "Menu Controls Preset", "Melee Weapon Preset", and
"Ranged Weapon Preset", each of which can hold up to 16 presets.

- Added a "Default 2" option for 5-button mouse controls on top of the regular "Default"
Keyboard Settings.

- Changed the error messages that are displayed in the following circumstances:
　・When the session is full: "Failed to join the session because it is full."
　・When the session you tried to join no longer exists: "Failed to join the session
　　because it has been deleted."

- After re-evaluating the quest completion rewards for the Tempered Deviljho quest "Relish the Moment," we changed the "♥♥♥♥♥♥ Ore" item drop to "Warped Feystone."

- Changed the design of the Kulve Taroth quest so that, once you've received the rewards for the quest, you will not be able to post or join the quest for that particular Kulve Taroth again.
If you cannot post or join a Kulve Taroth quest, you must either wait until the other players in the session have repelled the Kulve Taroth, or move to a different session.
Then you will be able to post or join quests for a new Kulve Taroth.

- The order of melding ingredients at the Elder Melder has been resorted according to the same sorting method used for items. In previous updates, new items were added to the end of the ingredient list, but now new additions will now follow this new sorting method.
No items have been removed from the current ingredient list.

Originally posted by Capcom:

Bug Fixes:
- Fixed a bug where players wouldn't be able to use the keyboard to access the custom radial menu while moving around if the menu controls in the Keyboard Settings were bound to the WASD keys.

- Fixed a bug that sometimes caused the framerate to drop during some monsters' attack animations.

- Fixed a bug where, when sorting equipment at the item box, sorting weapons by the "Great Sword" category would also sort Sever-type Kinsects to the top of the list, and sorting weapons by the "Sword & Shield" category would also sort Blunt-type Kinsects to the top of the list.

- Fixed an issue for players who were unable to unlock the 8★ quest "Lightning Strikes Twice". This issue occurred very rarely in high rank quests and expeditions, preventing research points from accumulating when you collect high rank Kirin traces. Updating to version 5.10 will allow the quest to unlock, but you must re-gather the necessary research points.

- Fixed a bug where the notification beginning "Continuing the game in offline mode. To connect..." would not display when a communication error (due to signing out from Steam, or from being disconnected) occurs when creating or joining a new online session while already in a session.

- Fixed a bug where your Palico would fail to restore you after running over to hit you to recover from paralysis or sleep (as a result of using the "signal" command as it runs over, causing an error in its movement destination).

- Fixed a bug where the effects of Demondrug, Mega Demondrug, Armorskin, and Mega Armorskin that were applied to a Palico via the skill "Wide-Range" would expire for the Palico when they fainted in combat, but the expiration of these effects would not be properly synced between the players during multiplayer.

- Fixed a bug where a monster hit with the Dragonator by a guest player in a Special Arena quest would not properly flinch from the attack, if the host player is far from the monster and accessing the supply box or otherwise waiting in camp.

- Fixed bugs that occur when (a) you are targeting a large monster with the target camera and its icon on the lower left part of the screen is grayed out, (b) the icon of the monster you are targeting is the furthest icon on the left, and (c) any of the following conditions mentioned are met.
1. Fixed a bug where, when using the focus camera, the target would switch away from the large monster when a small monster's icon was added to the leftmost end of the target list.
2. Fixed a bug where, when using the target camera, the target would switch away from the large monster when a small monster disappears from the target list.

- Fixed a bug where the health gauge wouldn't properly change color after being inflicted with the poison or bleeding status after finishing a monster mount.

- Fixed a bug where the order of items in the item bar would change unintentionally when you change your equipment loadout and your items are lined up in certain ways.

- Fixed a bug where the order of items in the item bar would change unintentionally when you register an item loadout when you have supply items. When saving an item loadout, the order of items registered will ignore supply item data, and supply items obtained again afterwards may be in a different order, but this is not a bug.

- Fixed a bug where female characters' hair would not move properly after equipping the head armor "Shadow Shades" or the layered head armor for 'Bushi Kabuto "Sabi"' and 'Bushi Kabuto "Homare"'.

- Fixed a bug where the "x" objective marker would not be properly displayed when Diablos moved areas at the Wildspire Waste.

- Fixed a bug where Palicoes would behave unnaturally when playing the Left Quite the Impression quest in multiplayer.

- Fixed a bug for the First Wyverian Ritual of the Melding Pot where the number of materials used would automatically decrease or it would not be possible to manually reduce the number of items under certain circumstances.

- Fixed a bug that allowed players to use SOS flares from the shortcuts with unintended timing when using keyboard controls and having One Key Keyboard Shortcuts turned on.

- Fixed a bug where graphics around the neck would be missing when a female character equipped the Vangis Mail β.

- Fixed a bug where the back of the Rathalos Helm would be spinning when starting the Rolling Thunder event scene as a female character with the Rathalos Helm equipped.

- Fixed a bug where the sound effect for confirming a selection would be played when clicking the currently selected tab again while multiple tabs are open.

- Fixed a bug where Shamos Tailraiders would behave unnaturally during the "Troubled Troupers" quest.

- Fixed a bug where the focus would shift to the top item when sorting the crafting list.

- Fixed a bug where Palicoes would face backwards when the player fast travelled to Northeast Camp (15) in Wildspire Waste and immediately entered the tent.

- Other minor bug fixes.

Originally posted by Capcom:

Combat Bug Fixes:

- Charge Blade
Fixed a bug where, if your Charge action is interrupted by damage when chaining it into a Condensed Element Slash in order to power up your Sword Mode attacks, the next attack will no longer mistakenly benefit from additional hits from phial effects.

- Dual Blades
Fixed a bug where graphic and sound effects were not triggering correctly when exiting Demon Mode after any of the various combos.

- Bow
Fixed a bug where Dragon Piercer would fire outside the intended range when pressing the left trigger just as you release an arrow when the camera is facing outside the intended aim range.

- Skills
Fixed a bug where the effects from "Critical Draw" and "Punishing Draw" would expire before you could do damage with your weapon, due to unrelated, continuous damage sources such as torch pods. The effects from these skills will now only expire once you have made a direct weapon attack (including arrows).


Localization Bug Fixes
- Fixed a bug where the translation for "Load Special Ammo" was the same as for "Reload" under Keyboard Settings in some languages.

- Fixed a bug where the Traditional Chinese translation for Kulve Taroth was displayed incorrectly on the Kulve Taroth Siege tutorial page.

- Other minor bug fixes.