I was using cheat engine to mod halo while I was waiting for crucible to load did i do something wrong here halo mcc supports mods.
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Cheat Engine is a memory scanning and modification tool. It will try to attach to any running program and read its data. While you may not have been targeting Destiny 2 itself, by having the two running at the same time Cheat Engine attempted to access and read Destiny 2's data, which the game will detect and stop, resulting in your ban.