@meddler: atmas reckoning does not share the same design space with titanic hydra
it was a poor reason to not include the item in the preseason update.
backloaded ad for juggernauts, that ramps up slowly over the course of a fight and increases ability damage instead of just auto attacks. some resistances to make health from other items a bit more effective.
its a lategame item that requires at least 2 to 3 health items before it becomes effective.
fighters who would like this item:
and other ad fighters who scale with abilitiy damage.
frontloaded burst damage from the auto reset and large damage on the active. improved waveclear and aoe damage. on hit damage that scales up with attack speed.
effective a lot earlier than atmas. either as a second item or even on its own when its completed.
fighters who like titanic hydra:
basically fighters with inbuilt attack speed steroids and who deal most of their damage with basic attacks.
if youre afraid that some champions might become too strong by stacking both of those items, just give them same name passives. considering both of these items have health scaling damage passives, it would logically make sense in this case.
but saying that these items are too similar and share the same design space is poor reasoning to not include them in the preseason update.
the same goes for
and 
steraks is an anti burst item for juggers. shojin is an item that increases defenses for divers with more enemies around. i dont see how theyre even similar other than some of their base stats.