Chaos tower can be entered from Castilla Temple, which can be entered from doing the Castilla Ruins quest or by warping after completing the Castilla episode 2 quests. To reach the tower entrance you'll need 3 golden pieces and 2 golden relics to enter it.
Difficulty:
Hard to Insane depending on boss, 12 families is maximum here and you'll want to bring as many as you can each time.
Raiding Strategy:
Like mines and relics, this is a series of bosses and their minis.
Elnugad and Elbrid:
The first 2 bosses are actually quite easy, but need to be killed at roughly the same time to be able to advance.
Their agro is also random, and they easily kill most robe/coat users. Both have 67 AR/DR.
Elnugad, Elbrid and Grief:
They're back already, and gained 1 more ar/dr. After killing both a third similair boss spawns which you also need to kill.
Einwind:
Good old einwind, hugely beefed up with it's 70 ar/dr and unremovable lightning arm.
Just keep ressing and try to tank him away from the majority of the people. Deals lightning dmg as usual.
Dominator:
A quick strong melee boss, who has a high chance of inflicting shock on his attacks. And thus pretty much kills whatever it shocks... Ignore harm is a godsend here, so wizards, recklesses and emilia's bring a rod!
Even though it has 71AR/DR and very strong attacks and skills, it won't often wipe a party because he never hits a lot of targets. As long as you keep rezzing it should be doable.
On his death he'll drop a roulette chest.
Npc room:
Here you can talk to a mysterious npc and decide to:
A) ignore him
B1) stop exploration, after which the npc will ask if you're sure if you reply you'll take his help several npcs apear which give a random buff that goes up to 50% atk, 5 ar, 5 dr max.
B2) stop exploration, and say you're sure. this will stop the raid and count as a completion.
C) say you'll continue, this spawns a new npc which offers to you warp you past the 2 bosses for 10 ancient gold relics. (for 1 person only, and despawns Tesla Coil boss and frees up movement to the Beholder boss)
Tetrapod:
Random spider robot wannabe with 72 AR/DR, uses a very strong lightning aoe skill he randomly casts somewhere. Mostly Random agro, but occasionly it will try to use a skill on a specific character, if he runs away you can kite this boss.
Teslacoil:
The grand murderer of families, having 74 DR/AR and often spamming a lightning aoe which pretty much 1hits anything. Just make sure you keep away when he's suddenly slowly moving that means he'll prob use his skill. res up, cast magic barrier to keep as many alive and kill the minions asap when they spawn. (they look exactly like the real one but tiny bit smaller and hit for less dmg) Can be skipped via npc.
Beholder:
The joke boss, even though it has 75 AR/DR it doesn't pose much of a challenge. His normal attacks hurt a bit and can freeze, but skills can't even 1hit masters in 96e/LN's. Atop of that he's fond of using a melee skill with hiss drill but when he's targeting someone for it he can be vergo style kited.
Also drops a roulette chest.
Jellyfish:
basically a Teslacoil on steroids, it has 77 AR/DR and has a ranged double hitting high dmg attack with a chance to freeze. spams the same high dmg aoe skill like teslacoil and 1hits even more people with it.
He can be tanked, but it wont stop him from randomly using his skills, and the tanks usually don't last very long either. With a combination of Recover spam of scouts and quick ressing you should be able to down him.
He's also able to be kited vergo style, but i'm not sure how to trigger it...
Hydro Bomber:
unknown.
Light Gemini:
unknown.
Dark Gemini:
unknown.
Queen Valkyrie:
Has 3 phases, with more and more strength each phase.
After phase 2 the mysterious npc's return and offer help again or to end the mission.
If you accept their help several mysterious npc's will offer help (1-5 ar/dr/atk buff) for 3 ancient relics.
Queen Valkyrie also drops a roulette chest.
Boss drops:
- lv 100 enchantment chips
- Veteran enchantment chips
- mega ores
- random rings
- Pure ores
- Composite Steel
Roulette drops:
- 84e weapons
- 30 ar weapons
- 32 ar weapons
- 84e armor
- 27 dr armor
- 92e armor
- 96e armor
- Le Noir
- Recipe - 92e armor
- Recipe - 96e armor
- Recipe - Le Noir
- Recipe - Elite le Blanc
- Recipe - Elite le Noir
- Recipe - Greek Croma
- Recipe - Dragon Heart
- Recipe - Made Necklace
- Recipe - Cut Necklace
- Recipe - Crafted Necklace
- Recipe - Qualified belt
- Recipe - Artisan Belt
- Recipe - Magic Belt
- Recipe - Magic Earrings
- Recipe - top tier jewel recs
- Gold Earring
- Silver Earring
- Elemental Jewel
- Promotion Recipe - Veteran
- skill ring
- rough ore
- Random symbol
- Gold relic piece of ancient
- Gold ancient relic
Sources:
sge raid page