What is the best strategy to kill Secret Library Bosses?

Question

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The Secret Library quest is actually the hardest quest to complete, the mini bosses that must to be killed before going to the final bosses are hard to kill and you have to know how to kill it because if you try to kill it randomly you will fail 100%.
So what is the best strategy to kill each boss?

Bosses are:

Gorzindel
Mazzinor
Ghulosh
Lokathmor

Notes:

There are some old videos from the summer test server where people kills them "easily" but this is wrong because most of them have been changed and now the way to kill them is different so if you try the same strategy as the test server you wont complete it.

Answer 1

I killed all bosses in last time so I will share with you my experience.

Mazzinor 

In room with boss  you will see also Wild Knowledges . At first when you enter with your team to boss room you need to kill Wild Knowledges by using Stone Shower Rune  and Hell's Core spell  (flam ue). In same place where Wild Knowledges died you will see blue vortex (WARNING! you can't enter on vortex too early). The boss  will turn into a Supercharged Mazzinor  from time to time. (WARNING! After 8 seconds, it will cast an energy ultimate explosion that hits all squares of the room and can deal up to 8k or more damage). This hit can be avoided, to do so players must step on the existing vortexes to gain the appearance of a Knowledge Elemental . (WARNING! This transformation also lasts 8 seconds so you can't step on vortex too early).  If you do it too soon, you won't be able to renew it until it runs out and will be susceptible to the boss UE. Strategy in few steps:

1) After entering to boss room keep killing Wild Knowledges  you have to kill minimum 5 Wild Knowledges  to create 5x blue vortex for each player.

2) If boss turn into a Supercharged Mazzinor  wait 2 secound and enter on blue vortex (be sure that Ek and Rp found vortex because they can't use utamo vita).

3) Now is time to create new blue vortex by killing Wild Knowledges  and attack boss .

4) Repeat all steps until boss is dies .

Gorzindel 

After you enter to boss room you have to attack Stolen Tome of Portals (EK have to block boss , ignore other monsters around   ). WARNING! Before you kill Stolen Tome of Portals be sure that all members of your time are close because when it dies, its corpse will be a teleport in which everyone should quickly jump into. Each team member will be sent to a small room with a Malicious Minion  and one of five books that is responsible for one of the boss abilities or strengths. All members have to attack books before being sent to the main room again (I recommended to remove energy ring inside small room with one of five books). Repeat this process until all 5 books are dead, and at this point all you'll have to do is attack Gorzindel until it dies.

There are five books (every member of team will fight with one of them):

Stolen Knowledge of Armor 

Stolen Knowledge of Healing 

Stolen Knowledge of Lifesteal 

Stolen Knowledge of Summoning  

Stolen Knowledge of Spells 

Source : https://tibia.fandom.com/wiki/The_Secret_Library_Quest

Answer 2

Lokathmor 

After you enter to boss room you have to start by attacking Lokathmor . A few secounds later, the team will be sent to the center of the room with the invincible boss and trapped by Force Fields  .At this moment, the team should all focus on the same magic wall and kill it as soon as possible to leave the trap, because moments after the trap Lokathmor  will use an ultimate explosion that deals massive damage (I recommend to focus on the north magic wall) (Warning! The Force Fields deal Damage Reflection, and thus area attacks should be avoided at all costs, specially Ultimate spells which can be fatal for the mage casting it).

After leaving the trap, you have to kill Knowledge Raider  and Demon Blood  (I recomented to use Ue Flam/Frigo and Avalanche). Dark Knowledge  will spawn north of magic wall trap. You have to kill it and quickly pick up corpse (Parchment of Dark Knowledge ). Use it on the Writing Desk  on the west side of the room. (When killing the Dark Knowledge , have one player stay by the desk and then when it dies someone throws him the corpse in a pre-defined spot, so it's quickly used and no time is wasted doing this.) Now wait until the next Dark Knowledge  will spawn, kill it and put Parchment of Dark Knowledge  near Writing Desk (Warning! Don't use it on writing desk again) . use the Writing Desk, it will throw a Death Beam that destroys the remaining Force Fields  and sets Lokathmor  free, allowing the team to attack it for a few rounds. Shortly after, the players will be trapped in the center of the room again and repeat the previous steps until the boss has been killed (After leaving magic wall trap use Parchment of Dark Knowledge  on the desk and wait for spawn next Dark Knowledge (same method like before) than use the desk).

Ghulosh 

Before entering to boss room wear helmet of the deep .In room with Ghulosh   you have to keep minions of Ghulosh (Bone Jaws ) away from boss. During the fight, Ghulosh will transform into Ghulosh' Deathgaze . Your objective now is to get rid of the Deathgaze, but you can't kill it yourself. First, destroy The Book of Death  that spawns north of the room to release a Concentrated Death . Now, you have to make line up Ghulosh' Deathgaze  with the Concentrated Death , so when it uses its Death Beam it will receive a lot of damage as Damage Reflection. A good strategy is forcing the Deathgaze to stay on the tile left of the Magic Forcefield and then controlling the Concentrated Death with energy walls. 

The first two times that the Deathgaze hits the Concentrated Death, it will immediately disappear and Ghulosh will spawn back. The third time, however, will force you to actually get Ghulosh' Deathgaze to hit itself until it's dead, and then you'll finally be able to finish the boss.

Source : https://tibia.fandom.com/wiki/The_Secret_Library_Quest

Comments

I add 2 answers because of limit words.

Answer 3

GORZINDEL

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This is the only boss that I have killed in this quest , I went with a team of 700ED , 550 EK , 600 RP , 550 MS(me) and a 380ED.
We killed it following the same strategy as the summer test server since I got the spoiler from people that in this case this boss have not been changed at all and the strategy is the same.

Example on how to kill it: English Video that shows how to kill Gorzindel
I think I can find a twitch video where Lokathmor is easily killed and where it shows how to kill it but I dont still have that video so for the moment I can only give Gorzindel.