Combining the effects of frozen mallet and wit's end could make them viable.

Right now Frozen Mallet and Wit's End are two extremely unpopular and ineffective items. Frozen Mallet is really only useful on junglers with poor CC such as Shyvana, but they already have far too much synergy with other items to ever waste time or money on the build path. Wit's End is the unloved stepchild in a family of rageblades. It takes time to ramp up, just like rageblade, but never becomes as efficient and has an identity crisis. It's a semi-defensive item but it's base magic resist is pathetic especially considering it gives no HP, and honestly HP stacking counters mages far better than magic resist.

I think we can save both of these items if we make them one. Keep all the effects of wit's end and add the slow from frozen mallet, adjusting the cost accordingly. The MS slow from frozen mallet can remain the same or increase with each hit like the wit's end effect.

Imagine it. You're trying to outrun Warwick but he's chilling you to the ground every fraction of a second. Your MS is slowed to a crawl and by the time it's too late to run, your MR is shredded and it's too late to duel. It would be a good way to allow champions with poor CC to punish players who overextend. Obviously this item still won't work against champions who are playing it safe by warding and remaining close to their turrets.