Talk:List of champions/Attack damage/@comment-27251241-20151119234629/@comment-4068613-20151128030343

Since Rammus has base armor and his passive is guaranteed to be on at all times, it grants him guaranteed AD that scales with levels without any item investment or skill ranks.

So while it may technically be bonus damage, it functions exactly the same as base damage for all purposes except for Sheen items and Sterak's Gage.