Now a larger example. Here I take 8 slaves who with reverse communion should become monsters. It will also work with any number of slaves equal or larger than 4 though.
I don't know if this one is viable or not but it is great fun at least. The magic paths of the masters before and after communion are shown. The Myconid commanders automatically cast communion slave before battle and the three others automatically cast communion master. So communiing up like with Astral or Blood is not necessary.
Eight Myconid commanders. (Slaves)
(1) One Wyvern 2A2F -> 5A5F
(2) One Stag Centaur 2D2N -> 5D5N
(3) One Blood Beast with 2 bloodslaves. 2N2B -> 5N5B
Of the 8 Myconid commanders before any masters cast stuff like blessing and other small spells.
(2) Soul Vortex
(3) Blood vengeance
(1) Phoenix Pyre
(2) Personal regeneration
All slaves attack. If the master continue to cast stuff, the slaves after the masters will be unable to move. If your slaves all move before the masters this is not a problem of course. You have to consider this when you make your army. There is no way to change the order of the units. And the order on the battlefield is the same as on the deploy army screen.
You now have 8 Mistformed, Soul Vortexed, Blood Vengeanced, Phoenix Pyred, Regenerating, Blessed, fatigue free Myconid commanders on the attack
. Add in a city guard with E or W and they are Stone Skinned or Quickened too. Or Fire shielded or .....
Of course 3 casters with two paths of level 5 magic can also cast some major nasty spells themselves.