How does the upgrade system work?

[H4all]

As in: Treasures/Shipments/Techs.

E.g. when I have Imperial Musketeers, and I send a +15% musk damage shipment, I notice that the Imperial Musks attack doesn't get +15% (possibly due to earlier sent shipments). Another example would be the +xx% hero hitpoints treasures; they don't add up.

Anybody who can explain how the three different stat modifiers work and what base they use for the boost?

[_NiceKING_]

I think upgrades use basic stats as the base.

[deleted_user]

Most/if-not-all upgrades do not stack. I.e., they will upgrade based on the original unit stat, and not its current stats. A 15% musk upgrade to colonial musks will provide the same bonus as if it were shipped to imperial musks (i think.) So when you get the explorer hp treasure, I'm going to bet you were age 2 (automatic health bonus) and it upgraded based on age 1 stats.

Someone let me know if I am wrong.

[Durokan]

yeah, upgrades are based on the base statistic.

[adderbrain5]

and by the way, a 15 percent upgrade of 100 HP doesnt give it 115? I believe it;s only 107.5... at least thats what someone once said. I'm not sure why though. Could be wrong.

[Mr_Bramboy]

All upgrades from the hc/treasures are based on base statistics, except the one from Sioux which upgrades your explorer hp, strangely enough.

[_H2O]

upgrades are on base, aura's are on current i believe.

[H4all]

But does it make any difference if I send a HC shipment of +15% attack in Colonial or in Imperial age? Will the end result be the same?

Also, does this rule apply for eco-upgrades as well?

[_NiceKING_]

But does it make any difference if I send a HC shipment of +15% attack in Colonial or in Imperial age? Will the end result be the same?

Also, does this rule apply for eco-upgrades as well?

It does not make any difference.
The rule does apply for eco-upgrades as well.