All quotes are taken for the League of Legends wiki.
Upon taking fatal damage, Aatrox enters a **stasis **and begins draining his Blood Well, healing himself over the next 3 seconds. The amount of health restored is equal to 35% of the Blood Well's content limit, plus its amount of stored health upon activation
Active - Self Cast: Lissandra encases herself in a glacier for 2.5 seconds, becoming **untargetable **and **invulnerable **but unable to take any actions, similar to stasis.
Guardian Angel: Revives your champion upon death, restoring 30% of your maximum health and mana after 4 seconds of stasis. 5 minute cooldown.
Zilean places a protective time rune on an allied champion for 5 seconds. If the target takes lethal damage during that time, they will be placed in Stasis icon stasis for 2 seconds, becoming untargetable and invulnerable but also unable to perform any action. When they come out of **stasis **, they are revived with a set amount of health.
Note that Aatrox passive specifically says he enters stasis and Lissandra's ultimate specifically says she is invulnerable.
Fiora dashes around the battlefield — becoming **untargetable **in the process — dealing physical damage to random enemy champion(s) 5 times. Hits against the same target beyond the first deal 40% damage. The first and last attack will be against the same target. Each strike applies on-hit effects.
Fizz hops onto his trident in a nearby location, becoming **untargetable **for 0.75 seconds and gaining the ability to use Trickster.png Trickster for no additional cost before the effect ends.
Maokai transforms into an **untargetable **cloud of arcane energy that quickly travels to a target enemy, deals magic damage (capped at 300 against minions and monsters) and Root icon roots it.
Vladimir sinks into a 150-radius pool of blood, gaining 37.5% bonus movement speed that decays exponentially for 1 second and becoming **untargetable **for 2 seconds. Enemies who stand upon the pool are Slow icon slowed by 40%, and are dealt magic damage every half second while Vladimir heals himself for 15% of the damage done.
Master Yi becomes **untargetable **and leaps to strike up to 4 enemies, dealing physical damage to each and dealing additional damage to minions and monsters.
Elise and her Spider Swarm spiderlings lift up into the air, becoming untargetable
Note that theese untargetable abilities do not specify stasis or invulnerability. While you cannot be targeted by abilities or autoattacks, that doesn't mean that you are immune to the effect of abilities (i.e. DoTs) which have already been applied to you.