Leechs are stubby infected which spew acid onto the player, they often come in groups and are somewhat weak. Upon death, they leave behind a puddle of Acid which can be quite problematic, especially in tight areas. They lack physical attacks, so they do not pose much of a threat until they spew acid.
- It's likely they are named "Leech" for the damage you take for touching the acid puddle as you would take slow damage for a few seconds.
- These are a reference to spitters from the famous Left 4 Dead 2 zombie game, as they leave acid when dead and leave puddles of acid where they spew.
- Rushing through the Acid will still deal damage to the player regardless.