Forbidden Halls (Floor 5) - Gelebrons Tower Guide

This guide will tell you everything you need to know about the fifth floor, Forbidden Halls zone in the Gelebron's Tower Update
This zone is designed for levels 210-220. To enter it you need to complete the Terminus the Undying quest in the Summoning Chambers.

To advance to the next Zone, you need to complete the Inner Sanctum quest given by Sentinel Alpha at the Effigy of Gelebron Leystone, once you are level 202.

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Quests

Sentinel Alpha Quests
These quests will unlock the next zone, the Arcane Sanctum. The three bosses you need to defeat are Mordibrax the Eternal, Grand Orb, and Sentinel Omicron. Please see the map above for their locations. After this quest is completed, it is repeatable.

These bosses will call for help one time when they are first engaged, but do not call for help after. Kill all the adds, drag the boss to a favorable position, and then start fighting them.

The Lost Arrowheads
Vale the Archer, at the Effigy of Gelebron leystone, has tasked you with finding 5 different types of colored arrowheads, dropped from special 3* enchanted armor mobs in this zone. Find them, and when you return he will give you some XP.

Bosses

Unox Mindrender - Level 215/6* Exalted Dragonlord Boss

Drops Lexicons of Conjuring, Arcane, and Ancient Runes used in the EDL quests for chest, weapon, and offhand

Click here for a detailed strategy on how to kill Unox

Notes:

There are 7 adds in this area.
Each group should have a druid with Ward of Magic to help reduce deaths from Magic Vortex.
Full EDL armor helps a lot in this fight.
He enrages at 15 minutes

Skills:

Focus Beam
Magic Vortex
Storm of Chaos

Add Skills:

Barrel Roll
Occulus Beam

Dropped Items

Alchemic Rings

Monsters in this zone can drop rings ranging from +6 to +10 for the following skills:

Warrior/Rogue: Double Attack
Warrior: Rupture, Shield Wall, Shatter
Rogue: Life Steal, Expose Weakness, Riposte
Ranger: Double Shot, Explosive Arrow, Longshot, Sharpen Weapons
Druid: Energy Harvest, Sanctuary, Stinging Swarm, Bless
Mage: Ice Blast, Frostbite, Fire Attunement, Ice Attunement

Level Requirements are:

Mighty +6: 170
Majestic +7: 180
Royal +8 :190
Imperial +9: 200
Godly +10: 210

Alchemic Arrows

Monsters in this zone can drop arrows that rangers can equip in their offhand. Values listed below are damage added.

Alchemic Arrow of	Damage Type	Royal	Imperial	Godly
Might	Pierce	30	45	55
Flames	Heat	250	400	500
Frost	Cold	250	400	500
Lightning	Magic	250	400	500
Toxin	Poison	200	320	400

Spyrestone Bracers
Bracelets can drop from 4* sentinel mobs

Vendor Trash
Mobs in this zone can drop vendorable items listed below. Values are their max shop value

Eldrich Potions

There are three potions dropped by mobs that counteract the effects of certain areas in the Tower

Potion of Eldritch Shielding (Pink) - Protects from Eldritch Torment that causes damage over time (i.e. Sentinel Theta room)
Potion of Eldritch Fortification (Blue) - Protects from Eldritch Corosion that reduces armor (General Gron room)
Potion of Eldritch Unbinding (Green) - Protects from Eldritch Shackles that reduces attack speed (Floor 5 top right room)

Arrowheads

3* Abominax mobs in this zone can drop Arrowheads used in the Lost Arrowheads quest.