They say, "Pets are a human's best friends." If you are feeling lonely, these digital pets will be your companions. The best part they never go hungry and will provide your character with additional abilities.
Pet Rarity Levels
At launch, pets will be available in three rarity tiers:
Obtain a pet is by using a "New Pet Scroll. These eggs contains three tiers of pets: Uncommon, Rare, or Epic.
Want to hatch your Pet egg? Head over to Pet groomer and purchase a Pet Incubator for 10,000 Zeny.

Pet Groomer can be found in most cities.
Simply type in the chat /navi prontera 218/211 (A yellow indicate will lead the way to the NPC)
Location
Pet Combination
Players can combine pets of the same tier for a chance at a higher-tier pet. For example, combine 4x Uncommon pets to have a chance of getting a Rare or higher-tier pet. The combination may get a pet of the same tier too.
Players can access the pet combination system through the in-game Manual book.
Pet Combination Process
Open ROverse Manual Book.

Choose the pet tier you want to combine.

Choose 4 Pet Egg that you want to combine then press [make] to proceed.

Combination Fail
Players will be awarded pet fragments if the Pet Combination process fails. Collect 25 fragments to guarantee a better pet tier from Universal Exchange Alexa Except for [E] Pet's Spirit Fragment, which requires 50 [E] Pet's Spirit Fragments to combine into an [E] Pet Spirit Guarantee Scroll.
Chance of Pets Combination
Pet Tier
Combine To
Chance of Combination
Stats Provided by Pets to Your Character
Details of the stat bonuses that each pet grants to your character :
VIT + 2
DEX + 2
ATK + 2 / MATK + 2
Lunatic
LUK + 2
Picky
STR + 2
Chonchon
AGI + 2
Baby Desert Wolf
INT + 2
Rocker
ATK + 5
Spore
Critical (Critical Rate) + 2
Peco peco
MATK + 5
LUK + 3
Perfect Dodge + 3
Sohee
STR + 3
Weight Limit +500
Isis
AGI + 3
Attack Speed (ASPD) + 3%
Green Petite
VIT + 3
HP Recovery Rate +20%
Deviruchi
INT +3
SP Recovery Rate +5%
Baphomet Jr
DEX +3
HIT +10
Bongun
Atk + 5
Matk + 5
Atk + 2%
Matk + 2%
Alice
Critical Rate (CRI) +5
Critical Damage +3%
Incubus
Atk + 10
Atk + 3%
Succubus
Matk + 10
Matk + 3%
STR +5
Weight Limit +2000
DEF +50
Cat o' Nine Tails
AGI +5 / Attack Speed (ASPD) +5%
Movement Speed Bonus +3%
VIT +5
HP Recovery Rate +50%
HP/SP Recovery from Healing Items +10%
Dark Illusion
INT +5
SP Recovery Rate +10%
Magic Defense (MDEF) +10
DEX +5
HIT +15
Ranged Weapon Damage +5%
LUK +5
Perfect Dodge +5
Flee +20
Critical Rate +10
Critical Damage +5%
Max HP +5%
Maya Purple
Increase ATK +10 / MATK +10
Increase ATK +4% / MATK +4%
Increase Max SP +5%
Increase ATK +15
Increase ATK +5%
Increase Resistance to Frozen Status +50%
Owl Baron
Increase MATK +15
Increase MATK +5%
Reduce Casting Time by 15%