Open the console by pressing (PC), or via the pause menu (Consoles).

Example (Level 150): cheat GMSummon "Wyvern_Character_BP_Poison_C" 150 Note: The final tamed level will be (roughly 225).

commands (e.g., to quickly get the required 100+ milk) Color customization commands for your new wyvern

cheat Summon Wyvern_Character_BP_Poison_C 2. Spawn Fertilized Poison Wyvern Egg

They consume Wyvern Milk, which can also be spawned using gfi wyvern_milk 1 0 0 .

Their primary attack is a poison gas ball that deals massive damage over time in an area of effect (AoE).

to spawn them naturally, if that's what you prefer. Ark | How to Spawn a Poison Wyvern w/ Console commands