Phantom Zombies are very dangerous mobs that possess various abilities. They only spawn in Phantania, but not on The Player's first visit to the horrid dimension. They have 55 <3 and can be potentially life-threatning without the right tools to fight it with.
Phantom Zombies are not seen at first, but when The Player dies in Phantania, one Phantom Zombie will be spawned next to their death point. What is dangerous is that every time they die again, an extra Phantom Zombie will spawn (i.e. if the player has died twice, two Phantom Zombies will spawn, ect.). Phantom Zombies themselves are not a huge threat, but are enough to put the Player at high risk. They can throw blocks at The Player - but only one at a time - that deal a sufficient amount of damage. When Phantom Zombies are low in health, they will throw more blocks at once. When they die, if there is more Phantom Zombies in a 2x2 block radius (very close), they will take a small amount of damage. This helps if there is a horde of Phantom Zombies chasing the Player, since eventually a few will die from others dying and start a chain reaction. Upon death, they drop no items, but they do drop quite a bit of XP. Every time the Player tries to attack one, since they are ghosts, there is a 21% chance that the attack will go through them.
Phantom Zombies are spawned upon a Player's death in Phantania.