1. Is it Demonhunters or Grey Knights codex?
2. Do powers work across armies?
Shield of Sanguinius effect Thunder wolves?
Sanguinary Priest feel no pain effect a sisters of battle squad?
3. joining squads?
Can a Sanguinary Priest deploy in a rhino with a sister of battle squad?
4. Is it 2 full rosters?
So as a Tyranid example take 3 elites in one roster and 3 elites in the second roster giving the combined army 18 zoanthropes?