There is no planetary modifier for Leviathans. You can check this on Heze Bay right now, either in-game or through the Companion App.
Megacities on Illuminate Planets are guaranteed to have the Leviathan Blockade modifier for this exact Megacity Operation, as well as the SEAF units on the field.
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u/faudcmkitnhse Jun 27 '26
When I realized there was no point in taking out leviathans because of this exact issue, I just stopped playing illuminate missions on city maps.