Crystals fusion

[Arawenys (Guildmaster)]

The effects of Acrimonious and Backbiting crystals will be combined to a new named crystal called Bitter that will now deal critical attacks against any monsters when attacking from the rear.
The effects of Hunter, Mutinous, and Domineering crystals will be combined to a new named crystal called Pounding that will deal additional damage to any monsters.
The effects of Stalwart and Ararchic crystals will be combined to a new named crystal called Hardy that will decrease damage taken from any monsters.

Level 65 Niveots - Uncommon Rarity
You may receive a level 65 uncommon crystals from a Crystal Box. Crystal box will drop from the last boss for level 65 dungeons and you can get x2 Crystal boxes from your weekly bonus.
The new reputation merchant will sell these crystals directly for credits earned by doing the new daily system.
Using Niveot Structures by fusing three uncommon level 60 crystals for a small chance to receive a random level 65 uncommon crystal.
Some uncommon Niveots such as Backbiting, Acrimonious, Stalwart, and Anarchic can only be obtained by fusing crystals and not sold from the merchant.
Acrimonious: Increases Crit Power against boss monsters by +1.44 when attacking from behind. Cannot stack with other crystal with similar effects such as Bitter.
Backbiting: Increases Crit Power against normal monsters by +1.44 when attacking from behind. Cannot stack with other Backbiting crystals.
Bitter: Increases Crit Power against all types of monsters by +1.44 when attacking from behind. Cannot stack with other Bitter crystals.
Brilliant: Regenerate MP by 42 every 5 seconds.
Brutal: Increases damage by 9.6% on knocked-down player & all types of monsters.
Carving: Increases crit chance by 3.2%. Cannot stack with other Carving crystals.
Cruel: Successfully knocking down a player or all types of monsters increases Crit Power by +0.46 for 7 seconds. Cannot stack with other Cruel crystals.
Cunning: Increases maximum MP by 263.
Furious: Increases damage towards players & all types of monsters by 9.6% if you are below 50% HP.
Focused: Critical attacks against all types of monsters do +1.78 times damage if the monster is enraged. Cannot stack with other Focused crystals.
Forceful: Dealing a crit damage when attacking a player & all types of monsters from behind will increase your Power by 20 for 10 seconds. Cannot stack with other Forceful crystals.
Glistening: Dealing a critical attack when attacking a player & monster from behind recovers 80 MP every second up to 3 seconds. Cannot stack with other Glistening crystals.
Infused: If you get knocked down you'll recover 82 MP for every 1 second up to 3 seconds duration. Cannot stack with other Infused crystals.
Pounding: Increases damage towards all types of monsters by 8.1%.
Salivating: Recovers 84 MP when attacking a player. Cannot stack with other Salivating crystals.
Savage: Increases Crit Power against players & all types of monsters by +1.26 when attacking from behind. Cannot stack with other Savage crystals.
Slaying: Increases Crit Power by +1.64 against all types of monsters if you are below 50% HP. Cannot stack with other Slaying crystals.
Swift: Increases movement speed by 16 while in combat. Cannot stack with other Swift crystals.
Threatening: Increases monster aggro by 15.4%.
Virulent: Once you inflict a critical hit on a knocked down target, they'll receive 1298 damage every second up to 5 seconds. Cannot stack with other Virulent crystals.
Anarchic: Decrease damage by 8.1% from boss monsters.
Empyrean: Activates Shield to absorb up to 5886 HP for 10 seconds when knocked down or stunned by all types of monsters that are enraged. Cannot stack with other Empyrean crystals.
Fleetfoot: Increases movement speed by 31 while out of combat. Cannot stack with other Fleetfoot crystals.
Grieving: Recovers 110 MP when taking damage from a player. Cannot stack with other Grieving crystals.
Hardy: Reduces damage by 8.1% from all types of monsters.
Inspiring: 50% chance to recover 644 HP every 2 seconds up to 10 seconds when you get knocked down. Cannot stack with other Inspiring crystals.
Poised: Decrease damage by 8.8% when attacked by all types of monsters that are enraged.
Protective: Increases crit resist by 9.9% if you are below 50% HP.
Relentless: Increases maximum HP by 5,434.
Resolute: Decrease damage by 9.9% when below 50% HP. Cannot stack with other Resolute crystals.
Stalwart: Reduces damage by 8.1% from normal monsters.
Vigorous: Regenerate HP by 363 every 5 seconds.
Warding: 50% chance to provide a shield to absorb up to 4829 HP for 7 seconds when you get knocked down. Cannot stack with other Warding crystals.

Level 65 Vyrsk - Uncommon Rarity
The new reputation merchant will sell these Vyrsk (level 65 zyrks) directly from the Valkyon Scout Crystal Merchant. You trade your your earned Vanguard initative credits earned from Vanguard Requests by opening it with the "H" key.
You can use Niveot Structures by fusing three uncommon level 60 zyrk (any random zyrk will do) for a small chance to receive a random level 65 Vyrsk.
As far as I know, there's no such thing as a common rarity Vyrsk.
Swift Vyrsk: Attack speed increases by 1%.
Grounding Vyrsk: Endurance increases by 3.
Cunning Vyrsk: Maximum MP increases by 176.
Threatening Vyrsk: Monster aggro increases by 3.5%.
Balancing Vyrsk: Adds 5 Balance factor. (sooooo useless!)
Carving Vyrsk: Crit Rate increases by 6.
Succoring Vyrsk: Increases healing by 2.5%.
Powerful Vyrsk: Power increases by 3.
Unyielding Vyrsk: Adds 6 crit resistance.
Relentless Vyrsk: Maximum HP increases by 2,230.

Level 65 Niveot - Rare Version
You'll need a Dyad Niveot Structure by fusing three uncommon rarity level 65 crystal to transform into a this new rare crystal.
This crystal will have small boosted stats from the uncommon version along with a secondary effect randomly added to your crystal. It cannot be rerolled.
This only works for weapon and armor type crystals. Vyrsk will not work for this.
To get the Dyad Niveot Structures, you either get them from a crystal box, Enchantment Boon Box, or as a possible dungeon drop from the unreleased Elkara dungeons.
Once you equip the rare crystal to a weapon or armor, it will be soulbounded to that specific gear. You can still remove the crystal though.
These crystals cannot break upon death.
Sadly, creating the rare crystals are not tradable if you happen to get the one you don't want. You can at least bank them, but cannot put in guild bank.
Don't like the rare crystals you got? You can combine 3 of them with a normal fusion and get a new rare crystal!
Bitter: Increases Crit Power against all types of monsters by +1.52 when attacking from behind. Cannot stack with other Bitter crystals.
Brilliant: Regenerate MP by 43 every 5 seconds.
Brutal: Increases damage by 10.2% on knocked-down player & all types of monsters.
Carving: Increases crit chance by 3.3%. Cannot stack with other Carving crystals.
Cruel: Successfully knocking down a player or all types of monsters increases Crit Power by +0.48 for 7 seconds. Cannot stack with other Cruel crystals.
Cunning: Increases maximum MP by 263.
Furious: Increases damage towards players & all types of monsters by 10.5% if you are below 50% HP.
Focused: Critical attacks against all types of monsters do +1.88 times damage if the monster is enraged. Cannot stack with other Focused crystals.
Forceful: Dealing a crit damage when attacking a player & all types of monsters from behind will increase your Power by 21 for 10 seconds. Cannot stack with other Forceful crystals.
Glistening: Dealing a critical attack when attacking a player & monster from behind recovers 83 MP every second up to 3 seconds. Cannot stack with other Glistening crystals.
Infused: If you get knocked down you'll recover 84 MP for every 1 second up to 3 seconds duration. Cannot stack with other Infused crystals.
Pounding: Increases damage towards all types of monsters by 8.5%.
Salivating: Recovers 89 MP when attacking a player. Cannot stack with other Salivating crystals.
Savage: Increases Crit Power against players & all types of monsters by +1.32 when attacking from behind. Cannot stack with other Savage crystals.
Slaying: Increases Crit Power by +1.74 against all types of monsters if you are below 50% HP. Cannot stack with other Slaying crystals.
Swift: Increases movement speed by 18 while in combat. Cannot stack with other Swift crystals.
Threatening: Increases monster aggro by 16%.
Virulent: Once you inflict a critical hit on a knocked down target, they'll receive 1373 damage every second up to 5 seconds. Cannot stack with other Virulent crystals.
Secondary Weapon Effect 1: Decrease damage by 2.2% from enraged monsters.
Secondary Weapon Effect 2: Regenerates 28 MP when attacked by a player.
Secondary Weapon Effect 3: Resist critical hits 2.5% more when below 50% HP
Secondary Weapon Effect 4: Increase maximum HP by 1359.
Secondary Weapon Effect 5: Decrease damage by 2.5% when below 50% HP
Secondary Weapon Effect 6: Provides HP regeneration of 91 per 5 seconds.
Empyrean: Activates Shield to absorb up to 6903 HP for 10 seconds when knocked down or stunned by all types of monsters that are enraged. Cannot stack with other Empyrean crystals.
Fleetfoot: Increases movement speed by 33 while out of combat. Cannot stack with other Fleetfoot crystals.
Grieving: Recovers 117 MP when taking damage from a player. Cannot stack with other Grieving crystals.
Hardy: Reduces damage by 8.5% from all types of monsters.
Inspiring: 50% chance to recover 755 HP every 2 seconds up to 10 seconds when you get knocked down. Cannot stack with other Inspiring crystals.
Poised: Decrease damage by 9.3% when attacked by all types of monsters that are enraged.
Protective: Increases crit resist by 10.4% if you are below 50% HP.
Relentless: Increases maximum HP by 6,372.
Resolute: Decrease damage by 10.4% when below 50% HP. Cannot stack with other Resolute crystals.
Vigorous: Regenerate HP by 425 every 5 seconds.
Warding: 50% chance to provide a shield to absorb up to 5664 HP for 7 seconds when you get knocked down. Cannot stack with other Warding crystals.
Secondary Armor Effect 1: Critical hits recovers 20 MP every second up to 3 seconds when attacking from the rear. Stacks up to 4 times.
Secondary Armor Effect 2: Increase maximum MP by 66.
Secondary Armor Effect 3: Recover 63 MP when you are knocked down.
Secondary Armor Effect 4: Immediately regenerates 21 MP when attacking a player
Secondary Armor Effect 5: Provides MP regeneration by 11 per 5 seconds.
Secondary Armor Effect 6: Deal 2.4% more damage on knocked-down targets.

[Jelly]

It should also be noted that:

3 fine cruxes of the same color(armor or weapon) can be fused with a niveot structure to make a random fine niveot of the same color.
3 fine niveots of the same color(armor or weapon) can be fused to make a random new niveot.
3 fine niveots of the same color(armor or weapon) can be fused with a dyad structure and will create a random dyad with two effects. The possible effects are above under the secondary lines. Dyads also come with a higher base effect than fine niveots of the same type.
3 dyads of the same color(armor or weapon) can be fused to create a new random dyad of the same color. This is very useful as they are all random and while you still lose crystals it gives you a chance at getting what you want. You can also use dyads that are bound to old gear in the fusing process so it can be use to "recycle" old dyads also.

For the most part you will want dyads with the same base effects as your regular niveots.
For PvE weapons any of the reduce damage or resist crits are preferred, for PvP resist crits and max hp are the best.
For PvE armor it is HIGHLY recommended to have at least one of the restore mp on a back crit dyad, the remaining you are free to choose. For PvP you are mostly looking for reduced crits and reduced damage.  The biggest effect while slight is the extra HP from the base effect though.

If you have any questions about other dyads, what the effects are, or recommendations feel free to ask.