Minecraft | 1.5.2 Xray

Servers could force a default texture pack (though many 1.5.2 admins didn't enforce it). Also, you couldn't see cave edges, so you often walked into lava.

While effective, using Xray mods—especially on multiplayer servers—comes with major risks. minecraft 1.5.2 xray

If you run a legacy 1.5.2 server today (for nostalgia), you need to know how to block these exploits. Servers could force a default texture pack (though many 1