How do stacks work in the Borderlands Pre-Sequel?
I've noticed many skills reference a stack of some sort, but I can't seem to find any reference to the stack. Is it simply a counter? Do the stacks increase ever? Here is an in game example.
Defensive Subroutines. You randomly pick a Subroutine focused on Health or Shields, which grants increased Capacity and Regeneration for the chosen attribute. The catch? You deal reduced damage with all gun types. Upon selecting Subroutine you gain 100 Frag Stacks which decrease over time. When you run out of Frag Stacks, your Subroutine will be replaced with a new one.
Best Answer
A couple of examples may help to clarify what Stacks are about. Consider two of Nisha's skills:
Order: Every time you take 15% of your maximum health in damage, you gain a stack of Order. The more Order stacks you have accumulated, the greater your chance to instantly heal double the taken damage.
Wanted: When an enemy would cause you to gain an Order stack, that enemy gets a Wanted stack. When you damage an enemy who has accumulated one or more Wanted stacks, you do bonus damage to them base on the number of stacks that specific enemy has accumulated, instantly using up the Wanted stacks.
In the screenshot below I've been fighting a pack of lowly Kraggons to show how this works.
Above my experience bar you can see 15 Order stacks. This means that at least 15 times, something has damaged me for the equivalent of 15% of my maximum health.
By the 4 stars above the Kraggon Immolator's head, you can see that he/she has caused me Order-worthy damage at least 4 times.
Stack Limit/Cap/Max
When I say "at least" above, that's because there's a limit to the number of times an effect can stack. Wanted, for example, is limited to 5 stacks. Sometimes this will be worded as "Wanted can be stacked a maximum of 5 times" or "Wanted has a cap of 5 stacks".
Sometimes other skills will increase a stack limit. Again using Nisha as an example, Order has a limit of 10 stacks, but adding her Rough Rider skill will increase that cap (maximum) by 5.

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What are frag stacks?
Frag Stacks are basically units of time - you are granted 100 Frag Stacks at Subroutine activation, and they decay at a rate of one per second. Down the skill tree there are skills that allow the player to prolong or shorten a Subroutine's duration as follows: Grenade Vent adds up to 5 Frag Stacks per Grenade thrown.What is a stack in borderlands 3?
You can accumulate Rush ("stacking") and consume them by using your Action Skill, and the strength of the bonus you get from consuming them scales with the number of Rush stacks you had before using your Action Skill.More answers regarding how do stacks work in the Borderlands Pre-Sequel?
Answer 2
depending on the amount of ranks that are available for that particular perk they may increase, if it is the only rank available that they wont increase unless directly affected by a piece of equipment (eg. mod, Oz pack). and essentially yes it is a counter from 100> down, then it would reset as a different effect as described in the perk.
also I should mention that not all stacks work in this way, some you would have to earn (eg,x amount of kills/bullets fired....and so on = x amount of stacks) depending on which character, skill tree ect.
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