was officially added in as part of a Halloween update.

While Mal0 thrives in low light, complete darkness can cause other hostile mobs to spawn in your trap, killing the entity or destroying the Redstone.

Note: If "Mal0" refers to the SCP character (SCP-1471/MalO), there is no connection to "piston traps," and that would likely be a confusion of search terms.

A Moloch has a massive amount of health (roughly 500-800 depending on the difficulty) and regenerates quickly. Standard pistols or weak traps will not kill it before it heals.