List of Active Bonuses for companions.This comes thanks to Dardove oh the Official Neverwinter Forums
Thank you for compiling this list
Groupings are done by the collection the companions are in.The Divine and the AbyssalAngel of Protection -On Resurrection: You are shielded for 10% of total your Hit Points
Book Imp - +2% recharge speed
Beasts of FaerunTomb Spider - On Encounter user: 1% chance to inject deadly poison into target
Panther - Increases damage against Prone target by 10%
Honey Badger - Damage taken reduced by 10% when HP less than 35%
Cave Bear - +400 Hit Points
Boar - Affects Companion: +50% Critical Severity
The Dogs of WarArmored Orc Wolf - +100 Critical Strike
Wolf - +55 Armor Penetration and Recovery
Vicious Dire Wolf - 5% chance to interrupt your target.
Domesticated AnimalsCat - Reduce falling damage by 25%
Dog - +25 Armor Penetration
Hawk - +55 Armor Penetration and Critical Strike
Pig - 1% of your max HP healed every second you are controlled
Elemental FuryPhoera - On Resurrection: +1000 Regeneration and Power; Duration: 10 seconds
Mystic Phoera - On Resurrection: +1000 Regeneration and Power; Duration: 10 seconds
Galeb Duhr - Deal up to 10% more damage based on the percentage of damage you have taken.
Fire Archon - Increase damage against targets with less than 50% Hit Points by 5%
Protectors of the WildSylph - +50% Control Resist
Sprite - +2% Action Point Gain
Quickling - +100 Movement
Leprechaun - +5 AoE Damage Resist
Aranea - 3$ chance to have lightning strike target
Beasts of the FeywildBlink Dog - +2 Combat Advantage Damage
Pseudodragon - 20% chance to restore some Stamina/Guard when attacking
Portal Hound - +100 Deflect
Clerics of NeverwinterCleric Disciple - +25 Regeneration
Acolyte of Kelemvor - +3% Incoming Healing
Warriors of NeverwinterSellsword - +25 Power
Neverember Guard - On Damage Taken: 1% chance to heal 1% of Max HP
Man at Arms - +25 Defense
Cold Iron Warrior - Affects Companion: +20% increased damage versus Fey creatures
Mages of NeverwinterWayward Wizard - +25 Recovery
Cantankerous Mage - +15% Control Bonus
Rogues of NeverwinterWererat Thief - On Encounter Use: 3% chance to poison target
Slyblade Kobold - Increases damage against Rooted or Stunned targets by 3%
Magic ItemsIoun Stone of Might (Blue quality) - 3% Stamina Regen
Ioun Stone of Allure - +105 Life Steal and Deflect
Icosahedron Ioun Stone - +10% XP bonus
Dancing Shield - 1% Deflect chance
Jagged Dancing Blade - Affects Companion: 5% chance to reduce target's Defense
Dancing Blade - +3% Critical Severity
Beyond the GraveHelmite Paladin Ghost - +55 Recovery and Regeneration
Ghost - Affects Companion - +5% damage bonus
Skeleton Dog (white quality) - +25 Life Steal
Not in a collection: Phase Spider - Reduces the damage effect of Combat Advantage against you by 10%
Lillend - One Daily Use: Heal nearby friends 2% of their MaxHP once every 30 seconds
Skeleton Warrior (purple quality) - +165 Life Steal and Power
Archmage's Apprentice - On Encounter Use: 5% chance to slow target
Faithful Initiate - +55 Recovery and Defense
Mercenary - +55 Power and Critical Strike