is immune to all damage (except the targeted champion)?
Tell that to the enemy spawn turret... I was just in a bot game trying out Poppy and dove into their spawn trying to kill Taric and BAM I got fried. (I ulted Cho'Gath)
nothing is immune to spawn turret. trynd with his ult will instantly die there. guardian angel passive is ignored, etc.
sometimes champions can damage through it (not the marked one)
Poppy focuses intently on a single enemy champion, dealing amplified damage to them, and becoming immune to all damage and abilities from ENEMIES other than her target.
A turret is not an enemy, it is an entity. The only entity, in fact, that damages champions.
