Originally Posted by KevinDelMarr
The added 25 MS is actually counted as Bonus MS. If you start with no boots or MS stuff (just the base 350 MS) his passive gives him 2.5 AD, 10% of 25 bonus MS. Pretty neat, huh
I'm not so sure about this. From what I've seen(which is admittedly limited to Stonewall's videos), they literally just added 25 base MS to everybody, since if you have no bonus MS from runes/masteries the MS number stayed gray, as if there was no change from the base. Of course, I haven't played on PBE yet, so I can't confirm what that means, but it would just be weird if it apparently counted as bonus MS when the game displays it as base MS.