Ive had some interesting results from using 2 chanters behind a stack of fighters. although this is still pretty early game...
i just make a wall of fighters with the chanters behind with 2h spears and keep them pretty close together
Made the whole group moon godlikes with high might/int (18 for both) + Ancient Memory seem to give some decent survivability as they will all restore endurance each chant and on damage.
Also the stacking damage chants are ticking for 6-9 combined each chant which isnt too bad. When the meter hits 3 on both of them i spam the skeletons to flank enemies attacking the stack.
ill see how they go late game...