Why not give to Xerath a MS buff on his Q or W?

i have been thinking about it quite often and each time i face who now get a MASSIVE MS boost (even if she do not need it at all) ...even if you miss your target...

so here is my though. why not keep the self slow on xerath Q when he charge up, but give him bonus MS when(just after) he release ? something like: the more you charge up, the more MS you gain(that would mean up to +50% ms for 3sec after casting with a full charge)

or a flat amount just like old (W)Locus power ?

however if it s a flat amount maybe it would be better to give it to his W a bonus MS for allies ? working the same way as his slow. the closer to the center the move MS you get . meaning if you self cast you will gain MS.

basically: if enemy: slowed for X amount if allie: MS buff for the same amount

it could be great to be abble to have a glimps of hope when you get all in by a melee assassin or a tank bruiser. (remmember that xerath isnt an artillery anymore, he doesn t have any base magic pen and thus he can t really do more than a regular AP carry against tanks ... add the fac t that he have no escape, self slow and cant cast W while moving IIRC .. and with so much stealth, dash, tp ... you cant realy protect him.)

i think it would be nice in his kit and in his theme. i mean he manipulate ARCANE power ... so against enemie thoses aracne blast slow them ok and slow him while channeling. but for allies ? its a burst of pure aracne energy . a nice powersurge for allies [slayer-pantheon-thumbs] if you want you can even say that mage get more MS (or only mage get MS buff) but it may become too complicate so let s avoid it.