Abomination is one of the possible Wormhole guardians.
You need to stay in a green circle around him, other places filled with poisonous gas. This circle gradually narrows
Abilities
Spike Balls
Spike Balls
Summons 4 spirals of spike balls, whirling around him
Moving circle
Moving circle
When the boss lose 50% HP, spike balls disappearing and the green circle starts to move around him