Depends on if you can equip summoned units. If you can NOT equip, then its attack will max out at 6, and it will never have any defense because it is not wearing armour.
NB// The above sentence is void if spells are added which add armour, instead of increase dexterity, same with Str vs weapon. Unless the spells are not allowed on summoned units.
But i agree with you a bit, the 50HP is a little overpowered unless it comes up against a spellcasting Sov. (I was doing 20dmg per spell, and could cast 3 per turn 
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