As @Anubora says, that teleport belongs to the World Boss Abomination, but it's only active when he is alive and that happens 2 times per year.
There are 10 teleports to Abomination lairs all around Tibia. You don't have to worry about face the Abomination alone or something like that because that teleports actually leads to a Mini Boss and if the Mini Boss is alive, you will notice that all the map outside the teleport will be different, full of lava.
If you want to check more, the name of that quest is: Eternal Hate World Raid
https://www.tibiawiki.com.br/wiki/Eternal_Hate_World_Raid
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