The stats used in Champions League and Siege depend on the hero's base stats, which are then multiplied according to current rarity. There is no difference in stats in mid-tier rarity, for example, between Legendary (I) and Legendary X, but rather between Epic, Legendary, Mythic, etc. From this point, there are two types of enhancements that can further enhance these stats, equipment sets (★), and gild.
Base Rarity
Leg
Myth
Div
God
Etern
Gal
Legendary
base
x1.4
x1.6
x2.6
x3.4
x5
Each completed set of equipment (+1 ★) is worth +20%. This is a mostly permanent boost, as the only way to remove equipment sets is to Altar the hero without enough shards on hand.
Equipment Sets (★)
(blank)
★
★★
★★★
★★★★
★
★★
★★★
★★★★
Current Stat Multiplier
x1.0
x1.2
x1.4
x1.6
x1.8
x2.0
x2.2
x2.4
x2.6
As for gild, each is worth +0.1% stats, so 1,000 are worth +100% stats. Legendary through Legendary V hold a maximum of 500gild, while Legendary X goes up to 1,750gild. After Legendary X, each increase of rarity will give you +75gild until you reach Galactic X with the max of 5,500gild.
Upgrades[]
Upgrade
Icon
Unlocks
Effect
Description
Cost
Nesla Coil
Lvl 10
Increases Tikola Nesla's DPS by 150%.
While working with the test equipment don't forget about safety.
Nesla Winding
Lvl 25
Increases Tikola Nesla's DPS by 150%.
The lightning strike of this kind is capable of destroying every living thing in a huge radius.
Lightning Strike
Lvl 50
Increases Tikola Nesla's DPS by 150%.
Seems like Nesla himself doesn't fully realized the power of his invention.
The Great Experiment!
Lvl 75
Increases all heroes' damage by 2% of their initial value every 5 seconds after the level starts.
FOR SCIENCE!
Power of Fire
Lvl 200
Starting with 200 lvl the hero gets x4 DPS bonus for each 25 lvls.
-
Power of Soul
Lvl 1000
The hero gets x10 DPS bonus for each 1000 lvl.
-
Equipment[]
Every completed set of equipment gives x1,000 multiplier to DPS.