Black Panther, one of the beasts available in the game
Beasts are unique companions which give large permanent bonuses. They can be released at the Scarab's Game when you find all six sigils of prophecy in the Pharaoh's Vault. You obtain the beasts in a random order.
Upgrading
Each beast has a level and a rarity. The level of a beast can be increased with soul embers. The upgrade cost starts at 10 soul embers per level and increases by 1 soul ember every 10 levels. Each level upgrade increases all attributes of the beast, except for spirit, alchemy and librarian, multiplicatively by 10%. The maximum level of a beast is 110.
When a beast reaches a certain level, its rarity has to be increased with cobra keys before it can be leveled up further. Each rarity upgrade significantly increases the spirit gained from the beast. In addition, all attributes of the beast double, except for alchemy and librarian which increase additively by 0.15%. Beasts can have the following rarities:
Rarity
Level required
Upgrade cost
Total spirit gain
Effect
Common
-
-
1,000 spirit
Standard rarity so no added effect
Uncommon
10
15 cobra keys
3,000 spirit
+0.15% for alchemy/librarian
×2 for all other beast attributes
Rare
20
15 cobra keys
5,200 spirit
Epic
30
20 cobra keys
7,600 spirit
Legendary
40
20 cobra keys
10,200 spirit
Mythic
50
25 cobra keys
13,000 spirit
Titan
60
30 cobra keys
16,000 spirit
Angel
70
30 cobra keys
19,200 spirit
Celestial
80
30 cobra keys
22.600 spirit
Immortal
90
30 cobra keys
26,200 spirit
Primordial
100
40 cobra keys
30,000 spirit
All upgrades are multiplicative between different beasts and with other upgrades of the same type.