The Fire Golem is the last golem of the tree, but ironically enough he probably has the least uses of them all. A lot of monsters are immune or highly resistant to fire in Hell, making his fire-abilities less desireable for attacking, and a Clay Golem has more hp and a slowing effect, making it a better tank and more useful to help other minions.
Hit Points: 328(Normal) / 643(Nightmare) / 1063(Hell)
It is believed that all life was forged when fire, earth, iron and flesh were combined. A Necromancer learned in this art can summon a Golem constructed entirely from living flame. The Necromancer summons the Golem through accelerating particles of the air at an ever increasing pace. These particles then ignite and the Golem crackles into existence, seemingly out of thin air.
↑Diablo II Manual, page 77. Blizzard Entertainment, 2000.