My speculation is:
Arrow cart: 4 dice 7+ bleed unavoidable 1-2 AoE inderect, load, a friendly creature may use a full action to push the Arrow cart to an adjacent zone , mid mana, low armor, low life may not be place in a zone with another arrow cart
Catapult: 7 dice unavoidable 2-3, load high mana, mid armor, mid life zone exclusive
Ram: 2 dice + 6 dice against conjurations unavoidable melee, a friendly creature may use a full action to push the ram to an adjacent zone, low mana, high armor, low life may not be placed in a zone with another ram
Raised platform: Zone exclusive epic, you may place one siege weapon on this conjuration, the siege weapon gains inderect and increases maximum range by 1
Siege yard: epic zone exclusive, allows you to place three siege weapons in this zone regardless to restrictions.