Oh ok
let me think
well obviously this one needs at least 1,200hp, heavy armor, at least 6 armor
attack type could be normal, but chaos would be preferred
Abilities
Resistant Skin
Hardened skin
Critical strike (where "heroes" is checked in the targets allowed field)
Envenomed Weapons
Feedback (This will definitely make it easier to subdue a hero, especially an intelligence type)
Mana burn (For the same reason as feedback)
Hex (This is obvious)
*Spell immunity* (This is can make the unit too op)
Frost Bolt
Soul Burn
The list goes on but you get that basic ideas here,
In a map where I had to make this type of unit I created a modified knight unit with 1350hp, resistant skin, critical strike, mana burn and a hex ability, called it the Dawn Crusader