Hello Lazarus,

From what i know  on Team Battlegrounds no boost works there 👻

I used just the PvE solo + old 20% offense/defense  enhancer and i saw it works .

And at the last questions :   we  already forwarded this feedback for add also defensive units at the shop !

I wish you a good day !

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Does PvE Offensive League Enrichement work Team Battlegrounds?

No - that event is no bonuses.

Does Double Damage League Enrichement work Team Battlegrounds? 

Answer will be no. I have yet to see that the item adds any bonuses of any kind - so no idea what it is actually supposed to do - but the whole event is no bonuses, so answer will be no.

Are these two, and PvP Offense League Enrichement, stackable?  

They do stack and they stack with other bonuses e.g. normal 20% and 50% enhancers

Are these items stackable with the PvP Offense Solo Enrichment, Double Damage Solo Enrichment  and Defense Enhancer? 

Yes they all stack (although can't answer for the Double Damage as have no idea what it actually does)

Thank you for being so helpful here! 

The Double Damage Solo Enrichment increases the chance of critical damage to the troops that offer the possibility of critical damage. 

Which troops have a chance of critical damage?

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troops  that have  this  marker are  able to trigger the double Damage

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these  three are an example check their stats to see what units they interact with.

also check out these New  occult double  damage units

https://plarium.com/forum/en/stormfall-age-of-war/841_news/42172_tremble-at-the-latest-occult-warriors/

Do we know beforehand when this double damage is activated? How can we tell that it did activate?

The double damage chance is always active by default for such units. If you apply an Enrichment from the League Shop, the damage becomes higher for a certain period of time, indicated by a booster's characteristics. 

So, basically there is no way for us to know when it happened, or if it ever happens. To me that means it is useless.

If  a player compares past Battles with future  Battles  they should be able to make a comparitive analysis with out a problem. so all will not  find it useless

Hover your mouse over the units in the battle reports

My only problem with this is that this screenshot was taken from Team BG where these bonuses are not permitted LOL

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I think it's the bonuses  from lost arts that are wiped off the Regular units it appears  double damage ledgedary units are not included in that eqaution I have  learned something  it's a good day 

20% activation  so  the  more of these units  you send together you can most likely count on at least 1 in every 5 to activate does that help at all ?

A good rule of thumb would be to add 20% to total strength before you use these new units.

I wonder if any of these new units (like pve inf/cav etc) have any Resource Value at Battlegrounds - Most players claim that there is no value in using imperial and eldrich units, so new units would be useless too

I did some testing comparing the same battles (ie send identical attack at a target) with the damage doubler active and not active and saw no difference in results, indicating that the item had no effect.  If anybody has screenshots showing them working properly, it would be great if they could share them here.