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BladeDown
Since: Nov, 2020
13th Aug, 2021 03:00:26 AM
There is no video-game specific trope for this, but this certainly is rather specific case of Reality Ensues and/or Surprisingly Realistic Outcome
Basically, the damage is split between the targets, meaning the more people, the less damage each person takes, so it behooves the group to all stand in the blast radius. For an example, Final Fantasy XIV has numerous bosses who do this.