My last game with Nasus gain only about 15 AD from last hitting by 'Q' ability, while I absolutely last hit more than 5 minions with 'Q' in the whole game...
After 6 lv, my AD never increase again by last hitting with 'Q' ability
Or does Nasus's Q ability has such cap?
Nasus' Q does not increase AD. It increases the damage that the next Q does. Think of it as increasing the scaling of the Q, not the AD.
Look at the ability's tooltip the blue number is the scaling for last hitting on it.
© 2013 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.