When Nana's HP is below 50%, she will transform into Molina (a small cat) for 2 seconds, becoming immune to damage and crowd control effects. You can use this skill to escape to the base and refill your HP.
Skill 1 – Magic Boomerang
Nana will throw a boomerang that deals damage on its way out and back.
Skill 2 – Molina Blow
Nana will throw Molina at the target area, which turns enemies into small cats, temporarily rendering them unable to move or attack.
Ultimate (Skill 3) – Molina’s Meeting
Nana will summon 3 Molina in the target area which deals massive AoE damage and causes knock-up (enemies are thrown into the air).
Nana's Strengths and Weaknesses
Nana's Strengths and Weaknesses. Source: WikiFandom
Nana's advantages:
Strong Crowd Control (CC) (can lock enemies)
Very useful when a team fight occurs
Hard to kill due to passive immunity
Suitable to be a counter for agile heroes like Ling, Fanny, or Lancelot
Nana's shortcomings:
Damage is not as big as other Mages like Eudora or aurora
Highly dependent on timing skill
Less effective if the enemy has Purify or anti-CC
Recommended Build for Nana in MLBB
Skin Collector Nana Aqua Pura. Source: Mobile Legends
Here are the best build recommendations for Nana in Mobile Legends: