Hammer Editor

Tell me how to do that in the Hummer spawn gargantua be susceptible to the firing of conventional arms and to whom it will be possible to set the level of health

It’s not programmed to take conventional damage, you cannot do it in Hammer.
If you wanted to hack it, you might be able parent a fun_physbox or such an entity to the garg, and use that as a way to fake health, using I/O to kill the actual garg once it breaks.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.