So i feel kind of dumb asking this, but just how unique are the passives on support items? like if i build 
+ 
am i only getting +10% or do i get more? Like is it just to prevent people getting 6 and healing for metric butt loads, while also having a huge after death effect.
El Dongerino2 votesUnique Passives that have a name for example Phantom Dancer and HexDrinker/Maw share the "Lifeline Passive", these 2 items don't stack. If they unique passive doesn't have a name then the only limiter is buying more copies of it. Hope thats clear enough.
Pika3101 votes[{quoted}](name=El Dongerino,realm=NA,application-id=3ErqAdtq,discussion-id=JRl4jEui,comment-id=0000,timestamp=2019-12-08T22:53:53.263+0000)
Unique Passives that have a name for example Phantom Dancer and HexDrinker/Maw share the "Lifeline Passive", these 2 items don't stack. If they unique passive doesn't have a name then the only limiter is buying more copies of it. Hope thats clear enough.
I'm not 100% sure how Lifeline works, but for Spellblade having Triforce & Iceborn gives you both, sort of. Triforce's triple damage applies to the initial target, but Iceborn applies its Aoe damage to non-initial targets & still slows. Heck, you might be doing Triforce's triple damage, but as an Aoe? I'm not certain.
Or how about Energized. You literally gain every Energized passive, but apply the highest damage amount, which I believe is now the same amount for all except Fleetfoot, which doesn't do damage of course.
Point being, even named Unique Passives aren't truly "Unique." In fact, some are intentionally designed to be meant to be built together (Energized.)
Skia Asteri1 votesI'm not 100% sure how Lifeline works, but for Spellblade having Triforce & Iceborn gives you both, sort of. Triforce's triple damage applies to the initial target, but Iceborn applies its Aoe damage to non-initial targets & still slows. Heck, you might be doing Triforce's triple damage, but as an Aoe? I'm not certain.
Or how about Energized. You literally gain every Energized passive, but apply the highest damage amount, which I believe is now the same amount for all except Fleetfoot, which doesn't do damage of course.
Point being, even named Unique Passives aren't truly "Unique." In fact, some are intentionally designed to be meant to be built together (Energized.)
Some named unique passives like spell blade are special cased.
Beerstein2 votesI believe if they have a name they're unique to others with that same name. If they have no name just same item.
ZephyrDrake1 votesIf it just says "unique" all it means is that you can only get that particular stat once from that item but you can still get that stat from other items.
For example: 
has an unique passive that gives 20% lifesteal. If you get another one all you would be getting is 80 more AD but if you get 
you can still get more lifesteal that way.
Now if the passive is "unique: X" aka it has a name you can only have that passive once and only once. Doesn't matter if another item has another unique passive with the same name. You will only get the passive in question once. So you aren't doubling the effect of the passive or getting extra benefits from it.
An easy example are 
which all have the names passive "lifeline" but you aren't getting 3 shields ever. Only one will proc.
This is done to prevent people from stacking certain items due to their passives. Could you imagine if 
passive stacked? It would be a nightmare
Kazekiba1 votesCleaver used to stack with itself way back in Season 2. Fun times. 3 stacks of Cleaver every time you're hit... oof
NEEKO MODE1 votesThis is done to prevent people from stacking certain items due to their passives. Could you imagine if
Reminder that 
and 
used to have non-unique passives for whatever reason [sg-miss-fortune]
Kazekiba1 votesEnergized and Heal Power are designed to stack with each other, but unique passives with varying effects will activate as long as they're not overlapping. I.e., you can stack energized items but only one does damage while the others still apply all other (non-damage) effects like the shock, Slow and range boost.
Special note is THIS MEANS MASTERWORK ITEMS STACK as long as they dont have named passives.
(Zhonyas Paradox, Frozen Fist, Wraithblade, Trinity Fusion, Forgefire Cape, and 
don't stack. Rabadons Deathcrown should stack with Cap, but I haven't proven yet.)
