Havent played with slayers for quite a long time but as far I can see, a unit of slayer pirates only do good as you lack a bit firepower.
I know you said it should be a offensive lord, but if you want him to survive just for a while, atleast give him a rune of stone. Im sure it would help it a lot and compensate for the shield.
I would also recommend using the master rune of swiftness for atleast one of your dragon slayers. Need to take advantage of all their attacks.
But else I think your army looks pretty solid. You could consider swapping the hammers for the IBs but its not a must.
I know you said it should be a offensive lord, but if you want him to survive just for a while, atleast give him a rune of stone. Im sure it would help it a lot and compensate for the shield.
I would also recommend using the master rune of swiftness for atleast one of your dragon slayers. Need to take advantage of all their attacks.
But else I think your army looks pretty solid. You could consider swapping the hammers for the IBs but its not a must.