Currently, Fortresses are even less of a threat than an Archer Tower near a Tower of a Light.  This seems like a logical fallacy.  One would think Fortresses would be fearsome, or at least carry more of a threat than an Archer Tower.

My suggestion would be to have Fortresses' (DEFAULT) attack work similarly to an Archer Tower, +25% more damage.  In addition to a Fortress' health being five times more, as well as being upgradeable with Trebuchets and Fingers of God, this would make them a lot more difficult for a single Demigod to take down.  As it stands, anyone with Health armor can stand there tanking a Fortress.  But attacking a cluster of Towers requires a much stronger Demigod (or an Uproot QoT/Scope Reggie)

So... Faster Attack Speed (Equal to Archer Tower),

Same damage as they have already.

Same health as they have already.