Every 10 minutes upon defeating the ender dragon, her apostles will start summoning to fight you because for them you are a "False Hero". The raid usually consists of 2 who wields an axe and 2 who wields a bow with deadly (and annoying) tipped arrows.

Beware as their AI is different to enemies you have previously encountered before...

The statue is a structure oftenly found in meadows that was built as a tribute to the legendary Zafirah, but in truth it was built to prison her soul forever, exiled from the overworld for her sins. You can break Zafirah from her prison by dropping a nether star on it, it will only activate once you have defeated the ender dragon.

Around the statue grows "Sinner Fruits" (Which are kinda like devil fruits but not really...)
Eating the sinner fruit raw will immediately kill you unless if you "brew" it first.

To brew a sinner fruit, you must throw the fruit and an empty bowl on a cauldron filled with water over a lit campfire.
Doing this will grant you the "Soup of Longevity" which is basically a better Enchanted Apple.
(This is very important if you don't want to suffer mid-fight.)

During phase 1, Zafirah has 4 abilities, she will eat a golden apple to regenerate after each ability. You can quickly stop Zafirah from gappling by hitting her mid-eating animation.

Heavy Slash
She will dash forwards and slash you, then proceeding to instantly slash her surrounding area multiple times.

Horizontal Slashes
She will sweep her blade and create three sharp gales of wind, you can duck / sneak to take less damage.

Vertical Slash
She will pause for a second and unleash a fatal vertical slash that can instantly one hit unprepared players, afterwards she will dash forwards and do a horizontal slash to deal more damage.

Judgement Cut
After she pauses for a moment, time seems to freeze. You can't move at all, you can't do anything but bare witness as Zafirah will slice and cut everything around her in a matter of seconds, you can duck / sneak to take significantly less damage.

-- SPOILERS AHEAD! --

During phase 2, Zafirah has 7 abilities, she will pull out a crossbow and shoot devastating arrows imbued with souls. You can stop Zafirah from continuing to shoot by hitting her mid-shooting, you can also sneak with a sword to parry her crossbow arrows.

She have two types of abilities, Type 1 involving her imbuing her blade with pure mortal spirits, usually has a cooldown before activating. Type 2 involving more weaponry-based abilities, usually indicated by a lightning strike.

Mortal Spirit Slash (Type 1)
Basically that one sword saint ability from Sekiro.
She creates a massive slash that goes around her twice, insta kills anyone on the way.

Dancing Slashes (Type 2)
She dances and dashes through the air, sweeping her darkened blades, you can duck / sneak to take less damage.

Diagonal Slashes (Type 1)
A combination of Horizontal and Vertical slashes, imbued with mortal spirits.

Unhesitant Slashes (Type 2)
A faster yet weaker version of dancing slashes, usually for closing in distance, you can duck / sneak to take less damage.

Instant Cut (Type 1)
She holds her stance and unleash a huge and fatal diagonal slash imbued with mortal spirits, has an arguably long cooldown before activating.

Spirit Bullets (Type 2)
She pulls out her crossbow and fires an even more powerful version of the arrows she usually fires, explodes upon hit, you can parry it but you might as well just run around.

Final Judgement (Type 1)
An even more deadly upgrade to Judgement Cut, has a bigger range and deals more damage, you can duck / sneak to take significantly less damage.