const 4 until you want dragon armour (const 6) which i highly recomend (its 18 prot, -1 def, 1 enc and only 10 gems) i cant remember my scales but i took a slight dip in must with a rather big sloth dip (sloth 3 iirc)
if you can find sages with this set-up that is AMAZING because pans mages are so expensive (and it means you dont have to mass pan's just to get a lucky astral)
i suggest going for conj after const for lamia queens and tarrasques.
heres my favoured setup:
4x white centaur commander with:
gloves of the gladiator
horned helmet
green dragon scale armour (can use a lower level armour until this is reached)
lucky pendant
ring of regen
1x dyrad (prophetised if possible)
set the 4 centaurs at the flanks to attack archers with the dyrad spamming bless. the centaurs have survived everything ive tested them on (apart from aby/30+ arbalests) including lvl 20 ulm/jotun pd. they get 6 flaming attacks each (hoof, helmet and 4x gloves) 5 regen per turn when blessed, 23 or so health, 18 prot (21 when berserk) and 16-20 def (cant remember)
i considered giving them horror helms but i value killing the enemy more than gaining ground so the longer enemys stay the better (most of what they could scare they could kill so...)
the idea configuration that i posted costs 35 nature (25 without armour) 5 astral and 80 gold per centaur which sounds quite alot for a thug but i strongly suggest you try them (i am rather proud of my first practical thug)
and of course if you dont want to make a big team like i said you can always just do 1-2 centaurs roaming the enemy lands, picking off searchers/blood hunters and self buffing themselves (i prefer not to let them self buff because if some-one else buffs them they only recieve 2 turns of fire max if deployed forward)
edit: i forgot to check but pangea's units have high mr right? they seemed to be quite effective vrs the undead that tried to paralyze them
edit again: just took down a large BF ulm army that included: massed x-bows, a ton of paralyzing guys, and a 110 health, fire shielded (11 ap damage) astral shielded moloch (although that was probably due to the guy whos heroic strength left him with 4, high attack, flaming, strength 42 attacks per turn
)