Lilith and the Camp
After snapping her fingers, the scenery changed. Those hidden objects materialized themselves before our eyes, which should be impossible to achieve.
The cloud of smoke that Lilith produced came from an illusion spell that only high-skilled mages could conjure. That spell had a similar ability to Meliodas, but it controlled the perception of both enemies and allies.
Players did not consider those illusion skills as overpowered. Well, since self-inflicting wounds could counter them. When we used our gadgets, an option would appear in front of us, asking if we wanted to erase the illusion by hurting our own characters. Since pain would be enough to remove that status, everyone would use that suggestion to their advantage.
Some players would even use that ability, but act like that character was still in that spell. And when their enemies bought those acting skills, the wounded player would take revenge against the mage.