Potwory 
Xogixath
It's one of the bosses of Kilmaresh Quest....
Yaga the Crone
New Boss implemented with the Updates/8.2. Spawns with one Witch. Her name is most likely a reference to wikipedia:Baba Yaga, a witch that appears in ...
Yakchal
The Ice Witches Boss, talked about in The Holy Coffin (Book).
'''Note that she did not disappear after 45 minutes after the awakening!'''...
Yeti
Very rare monsters, not considered a boss, although they spawn irregularly and don't appear in the Tibian Library. On Folda, they spawn in small group...
Yielothax
These strange creatures can be found in a different dimension which can be accessed via a portal in a tower south-west of the Zao Steppe.
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Yirkas Blue Scales
It's part of the ....
Young Goanna
<gallery captionalign="center" mode="nolines">Young Goanna Artwork.jpg|Official Creature Artwork</gallery> They are a younger version of the Adult Goa...
Young Sea Serpent
New creature in Updates/8.2. After changing the looktype of this creature, CipSoft made a mistake, causing the items within the corpse to end up outsi...
Young Troll
Zamulosh
He's the minion of Bazir. Part of the Ferumbras' Ascension Quest....
Zanakeph
Zarabustor
He is the boss of Warlocks. Spawns with 2 Warlocks. Disappears one hour after respawning....
Zevelon Duskbringer
New creature in Updates/8.2. It can be assumed that he is an Elf Vampire due to the fact he says "Ashari", shoots sniper arrows and dwells in Hellgate...
Zomba
Zomba is the Lions' boss and only spawns during Darashia_Raids#Lions_west_of_Darashia. The following message will appear when he spawns:...
Zombie
<gallery captionalign="center" mode="nolines">Zombie Artwork.jpg|Official Creature Artwork</gallery>...
Zorvorax
This boss can only be fought when First Dragon Quest is active....
Zugurosh
He is a The Ruthless Seven Minions, and you must defeat him in order to proceed through The Inquisition Quest. Despite his might, the demon known as '...
Zulazza the Corruptor
It spawns during the Farmine Raids on the top floor of the furthest tower to the south, the highest tower in Zzaion. It appears when the final raid me...
Zushuka
This boss uses the revised reward system. Your rewards will vary depending on your participation in the fight. The Frost Spiders and Frost Servants wi...