Battle Mechanics
Notice 
Contents
Quick Reference
The following is a quick reference guide to the game mechanics. More detailed explanations of each mechanic are listed below.
Rage:
 Rage will cause the next attack to ignore a percent of defenses, dealing extra damage.
 [Formula] Filled Rage Bar = 40 + (2.5 * Level)
 As an attacker, rage is gained at a rate of 110% of damage blocked (by the opponents defense/resistance) + 1% per 4 support you have over the defender, up to a maximum rate of 125%. If at a support disadvantage, the minimum rate is 95%.
 As a defender, rage is gained at a rate of 25% of the damage taken, +0.25% per 4 support you have over the attacker, up to a maximum rate of 29%. If at a support disadvantage, the minimum rate is 21%.
First Strike
 [Formula] Chance to go first = 50% + ((YourSupport  EnemySupport) * 1.5%) + ((YourLevel  EnemyLevel) * 5%)
Deflect:
 Reduces the damage of the opponents deflectable attack by 65%. Chance to deflect is determined by the amount of Technology you have greater than your opponent (Technology Advantage). Your chance to deflect can be reduced if you have less Technology than your opponent.
 [Formula] Chance to Deflect = 10 + (Technology Advantage / 3)
 Chance to deflect can be raised to a maximum of 25% and be lowered to a minimum of 2%
Critical Strike:
 Critical Strikes ignores 30% of your opponents defense and resistance and deal increased damage. The chance to cause a Critical Strike is increased by Support.
 [Formula] Chance to Critical Strike = 4 + (Support Advantage / 7)
 The minimum Critical Strike chance is 1%.
 The maximum Critical Strike chance is 20%.
Stun:
 Base Stun Chance is determined by the skill. Stun Grenade and Overload have a base chance of 30%. The base chance of Maul increased with its skill level. Some Skill cores also add a base stun chance to the weapon it is equipped with.
 [Formula] Chance to Stun = Base Stun Chance  (Defender's Support Advantage / 4)
 The most chance to Stun can be reduced by is 12% (a 48 Support Advantage by the defender). Stun chance from Skill Cores cannot be reduced.
 NOTE: Chance to stun will not be increased if the attacker has more Support than the defender.
Block:
 Reduces the damage of a blockable attack by 85%. Chance to block is determined by the amount of Dexterity you have greater than your opponent (Dexterity Advantage). Your chance to block can be increased if you have more Dexterity than your opponent.
 [Formula] Block Chance = 8% + (Defender's Dexterity  Attacker's Dexterity) / 5
 If a defender is stunned, then the defender has a 0% chance to block.
The Rage Meter
The "Rage Meter" in battles was introduced with EpicDuel Beta Version 1.0.2.
What is the Rage Meter?
The Rage Meter was designed as a counter for highlydefensive builds (tanks) as well as a counter to players that repeatedly consume packs while waiting to use their ultimate skill. A player's Rage Meter increases each time they attack an enemy and each time they receive damage. When the Rage Meter fills completely, all of the player's attacks will inflict increased damage for one turn.
How does the Rage Meter fill up?
 As an attacker, rage is gained at a rate of 110% of damage blocked (by the opponents defense/resistance) + 1% per 4 support you have over the defender, up to a maximum rate of 125%. If at a support disadvantage, the minimum rate is 95%.
 As a defender, rage is gained at a rate of 25% of the damage taken, +0.25% per 4 support you have over the attacker, up to a maximum rate of 29%. If at a support disadvantage, the minimum rate is 21%.
Here are a few examples:
 Example 1 (DEFENDER):
 A player is attacked for 200 damage. The defender's Rage Meter will increase by 50 points.
 Example 2 (ATTACKER):
 As an attacker, you deal 400 damage and they block 200 of it with their resistance or defense. Your Rage Meter will increase by 220 points.
 Example 3 (ATTACKER):
 As an attacker you use Plasma Bolt for 340 base damage. The defender blocks 100 of it, bringing it down to 240 damage. Your Rage Meter will increase by 110 points.
Notice that the Rage Meter will fill more rapidly against an enemy that is heavily defended or wellbuffed. Additionally, notice that the Rage Meter will only fill when a player is attacking or taking damage ... actions like Healing, using packs, or casting a buff will have no effect on the Rage Meter.
How many points are required to fill the Rage Meter?
The amount required to fill the Rage Meter starts at 400 points and increases by 25 points per level. So for example, a level 5 character's Rage Meter would require 530 points (400 base + (25 points x 5 levels)).
How much more damage will a Rage attack inflict?
Rage attacks are designed to ignore 45% of defense (and yes ... it can stack with reductions from Critical Strikes and skills like Cheap Shot). Because the Rage Meter was introduced as counter for tanking, the damage increase will naturally be most noticeable against players with highlydefensive builds.
If ignoring 45% of defense and/or resistance gives a damage bonus of less than 100, the rage attack will instead add 100 damage.
What happens when attacks are blocked?
If an attacker is blocked, the attacker's Rage Meter will still fill up by the amount that the defender's defense or resistance would have reduced the damage had the attack connected. The defender's Rage Meter will not increase. Block will prevent 85% of the damage dealt by attacker. Blocked attacks cannot cause a critical strike or stun.
Rage Calculations
If both players have the same Support values, their Rage meters will increase at the same rate. Your rate is scaled upward or downward by 1% per 4 points of Support advantage or disadvantage you have compared to the enemy. (Additionally, remember that the original Rage rules still apply ... Rage increases faster when attacking heavily defended enemies, and your Rage increases slightly when taking damage as well).
The above increase maxes out at 15% in either direction  it can scale up to 125% of the normal Rage rate, and can be reduced to a minimum of 95% of the normal Rage rate. But the Rage rate can be increased if at least 1 Skill Point is added to Adrenaline , so that makes your Rage Meter fill up faster than it is supposed to be , so the minimum Rage rate you can get with Adrenaline at Level 10 is 115% and the maximum Rage rate you can get is 145% .
First Strike
First Strike is the chance for a player to get the first turn in a battle. Your First Strike chance is determined by Support and player level.
First Strike Calculations
Players begin with 50% chance of going first in battle affected by their Support and level relative to the Support and level of all the other players in battle.
Example 1:
 Player A has 60 Support and is level 32
 Player B has 80 Support and is level 30

 Player A's First Strike chance is (50% + ((60  80) * 1.5%) + ((32  30) * 5%)) = 30%
 Player B's First Strike chance is (50% + ((80  60) * 1.5%) + ((30  32) * 5%)) = 70%
Example 2:
 Player A has 87 Support and is level 40
 Player B has 35 Support and is level 39

 Player A's First Strike chance is (50% + ((87  35) * 1.5%) + ((40  39) * 5%)) = 133% (100%)
 Player B's First Strike chance is (50% + ((35  87) * 1.5%) + ((39  40) * 5%)) = 33% (0%)
Deflection
Deflections will reduce the damage of a delflectable attack by 65%. The chance to deflect an attack is increased by Technology.
Deflection Calculation
Players begin with a 10% chance to deflect all sidearm attacks. Your Technology advantage or disadvantage when compared to your enemy will affect this base chance. For every 3 points of Technology more you have compared to your enemy, you increase your chance to deflect their attack by 1%. Naturally, if you are the attacker, for every 3 points of Technology you have compared to your enemy, you reduce their chance to deflect your attack by 1%.
The chance for Deflection can not drop below 2% and the maximum chance for Deflection is limited to 25%. This implies that investing in Technology beyond a certain point will have no further improvement on your Deflection odds.
Critical Strikes
Critical Strikes ignore 30% of the defending player's defense or resistance. The chance to deal a Critical Strike is increased by support.
Critical Strike Calculation
I want to first provide some details on how your chance to deal a Critical Strike is calculated. To approximate your odds, take the difference between your Support and the target enemy's Support. Divide that difference by 7 and add the number you get to the base chance of 4%.
Let's use these numbers as an example: Your Support  64 Enemy Support  20
The difference in Support here is 44 points. Now, divide 44 by 7 and you get 6 (after rounding). So your chance to inflict a critical strike now becomes 10% (4% base odds + 6% Support bonus).
Also be aware that while Support improves your chance to inflict a Critical Strike, it also reduces your Enemy's chance to inflict a Critical Strike on you! In the same example, your opponent's odds to inflict a Critical Strike are very low (the minimum chance of 1% actually). This chance is calculated by taking the base chance of 4% and subtracting your Support bonus (which in this case is 6%). Since 4%  6% = 2%, the minimum chance of 1% is used.
Understand that a 10% chance to inflict a massively damaging blow is an enormous advantage. Consider this... if in your average battle, you live to see 5 turns, each with a 10% chance to inflict a Critical Strike, your projected odds of inflicting at least one Critical during the battle become about 41%.
Stuns
The chance to stun another player with a skill is reduced if the defender has higher Support than the attacker. The defender will reduce the chance to be stunned by 1% for every 4 points of Support they have more than the attacker.
The maximum any stun can be reduced will be 12%. Stun chance from Skill Cores cannot be reduced.
If the attacker has more support than the defender, the attacker will NOT increase the chance to stun the defender.
For example: If the attacker has 25 Support and the defender has 41 Support, the defender has an advantage of 16 Support. To determine the stun reduction, take the defender's support advantage of 16 and divide by 4. 16 / 4 = a 4% reduction in stun chance. If the attacker were a Tech Mage using Overload, the chance to be stunned would be 30% base chance  4% stun reduction = 26% chance to be stunned.
A player cannot block while stunned.
Blocking
A block will reduce the damage of a blockable attack by 85%. The chance to block is determined by comparing the two players' Dexterity. So for example, if you have Player A and Player B:
Scenario 1:
Player A  Dexterity = 20
Player B  Dexterity = 20
Because both players have the same Dexterity, if Player A attacks Player B, Player B's chance to block Player A's attack will use default 8% block chance.
Scenario 2:
Player A  Dexterity = 35
Player B  Dexterity = 20
In this scenario, because Player A has significantly more Dexterity than Player B, when Player A attacks Player B, Player B will have a "below default" chance to block the attack.
Block Calculations
Block is calculated by adding the block chance adjustment to the default block chance (currently 8%).
Block chance = 8% + Block Chance Adjustment
The chance to block can never be less than 0%. The chance to block can never be more than 35%.
Block Chance Adjustment = (Defender's Dexterity  Attacker's Dexterity) / 5
 Example 1:
 Defender has 100 Dexterity
 Attacker has 60 Dexterity
 Block Adjustment = (100  60) / 5 = 8
 Chance to Block = 8 + 8 = 16%
 Example 2:
 Defender has 60 Dexterity
 Attacker has 100 Dexterity
 Block Adjustment = (60  115) / 5 = 11
 Chance to Block = 8 + (11) = 3%
 Since the block chance can never reduce below 0%, the Chance to Block becomes 0%
 Example 3:
 Defender has 30 Dexterity (Also, the defender has a 40 Dexterity Debuff Applied)
 Attacker has 29 Dexterity
 Dexterity never uses negative values in calculations ... so even though a debuff is applied, the Defender's dexterity value is calculated using the minimum value of 1 instead of 10.
 Block Adjustment = (1  29) / 5 = 5.6
 Chance to Block = 8 + (5.6) = 2.4%
A good rule of thumb is that for every 5 points of Dexterity you have more or less than your enemy, your chance to block increases or decreases by 1% respectively.
NOTE: Guns, Auxiliary, some Skill Cores and many skills are currently unblockable.
Thanks to Titan, RabbleFroth and many others for providing this information.