Abysmal Sea creature who broke free from the seal.

Frigid BreathAtlas generates Frigid Breath around him for 5s each time he casts a skill. Enemies affected by Frigid Breath will have their Movement Speed gradually reduced over 2s, after which they'll be frozen for 0.5s. Atlas gains 20 (+0.5% Extra Max HP)- extra Physical & Magic Defense when Frigid Breath is present.
Atlas counters squishy heroes without mobility skills like Vexana and Eudora because they cannot reliably escape his CC.
Atlas is countered by heroes who can knock him away, such as Valir and Moskov, since they can easily stop his 2nd Skill which Atlas relies on to land his other skills.