Finite-temperature dense plasma relativistic atomic structure calculations are employed to study the energy eigen values and transition probabilities related to the 1s3l fine structure levels of He-like ions.We discovered a particular response of the level structure that is distinctly different from simple nuclear charge screening effects that exists also for atoms and ions in vacuum as Z decreases.It is demonstrated that characteristic level crossings are driven by the free electron screening due to a particular dependence on the quantum numbers of each level of the 1s3l-configuration.Levels with large 1 shift stronger to the continuum than levels with small 1 whereas spin dependent dense plasma effects are relatively small.As a result, the known energy level fine structure in vacuum is subject to characteristic changes (level crossings, level order).Numerical calculations performed for a wide range of density, temperature and different chemical elements indicate that induced level crossings and change in level order are general characteristics of dense plasma effects.