Once upon a Time...
A ’glom (short for conglomerate) is a group of corpses joined together into a horrifying mass and animated by an especially strong manitou. The parts of the component bodies can be seen clearly. although they are merged inseparably into a single abomination.
Most ‘gloms are formed from considerably more than two corpses, usually at the site of a recent battle. Even more terrifying is the ’glom’s ability to join additional corposes to its seething mass, increasing its power proportionately.
’Gloms use their limbs and whatever weapons are handy to kill any living person in sight. Whenever possible, ’glom add corpses to their mass.
Statistics can be located on page 93 of the Deadlands Reloaded Marshal’s Handbook.