Altar is where players increase their Companion Star level by combining two or more Companions together. Please follows this diagram for the rule of combinations:

1 star Companion can’t use this feature
2 stars Companion → 3 stars need 2 more Companions like the original Companion (Copy)
3 stars Companion → 4 stars need 2 more Companion of the same Faction with the original Companion
4 stars Companion → 5 stars need 1 copy of the original Companion 5 stars Companion → 6 stars need 2 “5 star” Companion of the same Faction with the original Companion
6 stars Companion → 7 stars need 1 copy of the original Companion
7 stars Companion → 8 stars need 1 “7 star” Companion of the same Faction with the original Companion
8 stars Companion → 9 stars need 1 “7 star” Companion of the same Faction with the original Companion
9 stars Companion → 10 stars need 2 “5 star” copy of the original Companion
A few notes when using this function:
– Increase stars for every 2 stars Companion you have to avoid filling up your inventory
– When upgrading Companion Legendary (original Companion 4 stars) from 5 stars to higher milestones, do not use materials which are Legendary Companions because those Companions can be useful in different maps. Please use the raw materials of the Companion 2, 3 stars to upgrade.
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