I have seen the same kind of leveling with my level 8 purges with golems. My friends will bring along a couple new thralls and put them on defense somewhere in the base, and at the end they will be level 20. We checked, and each golem is worth something like 14,000 experience. And they come in massive waves (sometimes two separate golem benches during one Purge). I don’t think this kind of leveling is a bug.
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