What is sion counters?

As an AI language model, I do not have access to the latest game updates and strategies, thus, below are general counters for Sion based on League of Legends' mechanics:

1. Champions with high mobility: Sion's main form of initiation and crowd control comes from his Q ability, which has a slow wind-up time. Champions with high mobility such as Yasuo, Zed, or Fizz can easily dodge or dash away from Sion's Q, making him vulnerable.

2. Champions with ranged poke: Sion's lack of mobility and his large hitbox make him an easy target for champions with ranged poke abilities, such as Lux, Caitlyn, or Xerath. They can harass him from a safe distance, making it difficult for him to engage.

3. Champions with healing reduction: Sion's passive ability allows him to come back to life with a portion of his health after dying. However, champions with healing reduction such as Ignite or Morellonomicon can reduce his healing and prevent him from coming back to life.

4. Crowd control: Sion's abilities are primarily focused on crowd control and disruption. However, champions with reliable crowd control such as Leona, Morgana, or Lulu can shut down Sion's engages and render him ineffective in team fights.

5. True damage: Sion's ultimate ability grants him a large amount of bonus health but also makes him vulnerable to true damage, which ignores all forms of mitigation. Champions with true damage such as Vayne, Fiora, or Garen can quickly shred through Sion's health.