The End has no new animals: what moves out there is the Ancients' work, purpur plates round crystal cores. Each construct has one rule, and the Codex writes it in when you first meet one.
Hides as a chorus plant until you come within 6 blocks, then lashes a vine that slows you and pulls you in. It spawns in the Chorus Thicket (weight 4, beside the endermen' 10).
Chorus Resin ×1 (+1 a level of Looting, killed by a player)
A lamplighter: hold Lumen near one and it follows at your shoulder, lighting the way behind you. It never fights. It spawns in the Lumen Mire (weight 10, beside the endermen' 10).
Lumen ×1 (+1 a level of Looting, killed by a player)
Every few seconds it blinks behind you and strikes. Looking straight at it freezes it where it stands. It spawns in the Voidscar Wastes (weight 8, beside the endermen' 10).
Rift Dust ×1 (+1 a level of Looting, killed by a player)
For 3 seconds its shield stops every blow from the front, then it lunges. Strike it from the side or behind. Pairs guard the Void Shrines and the Fallen Observatories, and the Hollow Sentinel calls them to its Foundry.
Ancient Purpur Scrap ×1 (+1 a level of Looting, killed by a player)
Hovers by a pillar and locks on for a second before it beams. While it beams the dragon heals: put a pillar between you. It comes only when the dragon calls it, in its third phase.
Crystal Fragment ×1 (+1 a level of Looting, killed by a player)
Climbs lattice and tears out the lattice block under you, which grows back 8 seconds later. It can't touch other blocks. It spawns in the Unfinished Edge (weight 6, beside the endermen' 10).
Raw Lattice ×1 (+1 a level of Looting, killed by a player)Each guardian is given its own Codex goal, and what it leaves for its fighters is kept for anyone dead or away when it falls.
The guardian of the Shulker Foundry and the first seal: a hovering purpur shell round a teal core. It wakes when a player in survival comes within 20 blocks. Closed, it can't be hurt and fires three Resonant Bullets every 4 s (4 damage and 1 s of Levitation each).
Resonite Upgrade ×1Ancient Purpur Scrap ×6–10
Ancient Core ×1 (to each who fought it)
Star Chart ×1 (to each who fought it)
The guardian of the Rift Maw and the second seal: a void wyrm that swims under the arena. Every 8 to 12 s a ring marks where it will breach, 1.5 s ahead; it bursts up under its target (14 damage in the ring) and rears for 4 s.
Voidsteel Scrap ×6–10
Echo Amber ×2–4
Voidsteel Upgrade ×1
Leviathan Scale ×2
Starmetal ×2
Leviathan Fin ×1 (to each who fought it)Star Chart ×1 (to each who fought it)
The guardian of the Unfinished Citadel and the last seal: a frame of Ancient scaffolding round a lit keystone, bound until its Amber Gate has been opened with an Amber Key. It raises walls of Phantom Lattice (seven wide and three high, for 10 s), throws Raw Lattice (7 damage, a lilac ring showing where it lands), and from 60% health unmakes the tiles under your feet, which come back 10 s later. From 25% it does both and calls Lattice Crawlers.
Raw Lattice ×8–12
Architect's Promise ×1 (to each who fought it)
Architect's Lattice ×1 (to each who fought it)
The End That Was Promised