LostWorld dimension is a very dangerous place because the world is not so easy to walk, It has very high places and the mobs population is very high here, a lot of ants, spiders, bogeymans and all creatures.

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This is not recomended for low PC specs because of density of mobs and higher montains.

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When you teleport to LowtWorld dimension, the portal created there is not a normal portal, a big place around the portal will be created with iron bars to protect you from mobs.