If you mean slash attack and special attack, it is colorless, except if written like, ex.: “deal more damage VS holy”.
Here is good explanation about elemental damage:
What Is Elemental Damage? - A Guide to Elements
I currently curious about Seshat minion attack which is not colorless, are all minions colorless or only Seshat? I will try with Buddy and Rudoplh farm S1:8-7.
EDIT 0: I already try farm S1 9-4, and Seshat minions is colorless. Well I whould take a note while I’m raiding next time, because it is always has written “STRONG” if Seshat minnions attacking yellow opponent.
EDIT 1:
I have try Buddy, but he does not get STRONG color advantage from minions.
EDIT 2:
Do Minions hit opponents as the same color as their host? Do they have strong/weak/neutral damage?
Back to topic, my trio epics teams:
BT-Wilbur-Falcon
Kiril-Grimm-Triton
Buddy-Hansel-Caedmon
Jackal-Chao-Li
Tiburtus-Proteus-Rigard