SFS Standard Zone Overlap [one-action] Feat 16

Source Player Core pg. 173
Requirements Your quantum field is active with one zone affecting it.
You cause a second zone to overlap your quantum field. You can choose to apply another zone you're able to create, or apply the existing zone again, improving its effects as follows: Danger Zone deals 1 extra damage, Debris Zone becomes greater difficult terrain, and Twisted Dark Zone ignores the temporary immunity of creatures that previously critically succeeded at the save for 1 round.

Traits

Anchoring:You can use abilities with the anchoring trait only while your quantum field is activated. If you use the ability on your turn, in addition to their stated effects, they automatically Sustain your quantum field.
Zone:These actions apply an additional effect to your quantum field. You can apply the effects of a zone only to a quantum field that doesn't have a zone effect.