How does Anivia's passive interact with unique item passives, item activations, and summoner spells? [duplicate]

Does Anivia still retain unique item effects while in egg form, such as Thornmail? Can she activate items like Deathfire Grasp? What summoner spells can she use, if she can use any at all?

Solution 1:

Anivia's Ability Details

Rebirth

While in this [egg] form Anivia cannot move or use any abilities

• No item active abilities
• No summoner spells

It's undocumented whether item passive abilties still apply, so it's a great candidate for testing.

Solution 2:

She's effectively stunned, so no active abilities or summoners. She does keep the same armor/magic resist, although the passive adds a modifier on top of that (negative at low levels, scaling up to +20 at level 15). I'm pretty sure Thornmail and similar passives still apply. Note that Guardian Angel is a special case: it triggers before the egg, so if you're in egg form it means you already used up Guardian Angel and it's on cooldown.

Solution 3:

While in egg form Anivia can't use any spells, item actives, or summoner spells.

She is basically a suppressed champion with different stats, although...

Items with passives like Thornmail, Frozen Heart, Abyssal Scepter... are still applied because the egg is still considered a champion. This differs from another champion with a revival passive, Zac, as his blobs are not considered to be a champion.

Revive effects are always triggered before the passive effect, the same applies to champions such as Aatrox, Karthus, Kogmaw and Sion.