Attack Attribute – Close Combat.
Right before the battle (during step 7 of the Deployment Phase Sequence), if you have one or more units of Rhamphodon Riders or Skink Captains on Alpha Rhamphodon in your army, you must choose 2 units from your opponent’s Army List (this may also be Characters). The models of these units are considered “marked”.
Rhamphodon mounts gain +D3 Attack Value and must reroll failed to-hit rolls for attacks allocated either towards marked models, or towards models joined to units with more than half of their models marked. The additional attacks must be allocated towards models meeting either of those criteria.