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The new Tsons book is full of cool design that we haven't seen before. One that popped up that I couldn't get to 100% on myself was Warp Sight:

"Use this Cabbalistic Ritual when a psychic power is successfully manifested by a unit from your army. If the psychic power requires you to select a unit visible to the psyker(A), for that manifestation you can select a unit visible to any friendly unit(B) with the Cabbalistic Rituals ability."

For certain I am using (B)'s LOS to the desired target but....

Who am I measuring range off of when I go to resolve the psychic power? Psyker (A) OR (B)?

To be clear:

every datasheet that has the rituals ability and would be eligible for warp sight contains a psyker and the execution of a power happens after it is manifested.

As it doesn't change range nor tell you measure range from Unit B, the target must be in the proper range of Unit A.

As above. Nothing says you measure from 7nit B.