^i think that would be overpowered. Having legendary tier items with CC reduction would be too powerful. The main reason why merc treads is overpowered is because it's useful at ALL stages of the game purely because it's a boot choice. To keep the other tenacity items from being overpowered they can't scale TOO well into the late game, otherwise they'd need to be extremely expensive, therefore making them not better than merc treads. My main point here is that the tenacity items currently have stats that pale in comparison even to the doran's items and thus they are completely useless beyond early game. These slight buffs would give them better scaling into mid game while avoiding that stage of being overpowered in late game.
Also,
Eleisa's Miracle is a legendary tier item, it can't be upgraded anymore.
Also,



Or make all 25 tenacity and make new items with 35, which build out of them. Like:



Well, and


Agree with searz, need t be able to be built into late game or else they won't really be used.

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The problem with tenacity items is, that no one wants to waste an item slot to %25 attack speed(in case you buy
Berserker's Greaves instead of
Mercury's Treads, and waste an item slot on an extra item for tenacity). That is a mere example, of course.
Also, @
Cloak and Dagger suggestion; it won't happen, because the name indicates you build it from a cloak and a dagger, not from a cloak and a bow.


Also, @

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Reduce tenacity on
reduce cost of merc treads from 1200 to 1050
Buff
Buff
Buff
increase price from 1300 to 1450