Charis:
We have traveled together, and perhaps already been in battle together. The ladies are both Nanos, and Charis can directly sense Sybella's emotions.
Therefore... what type of attack is Sybella using?
Sybella is using Onslaught.
Serren:
Can't you do tandem attacks, if one knows the tricks of the other ? I remember something like that.
You can as long as one is trained in the type of attack the other is using, then they can perform a complimentary attack of a different type to gain +2 on the roll. They both have to be targeting the same opponent.