Iron Golem

The really big buff is the poison breath goes from a 15ft cone to 60ft. That changes it from generally only hitting one, maybe two players, to almost always hitting the entire party. Additionally now having the 120ft firebolt to give it an effective ranged attack. Before iron golems were only really dangerous in a confined space, otherwise you can just run from it and pelt it with cantrips or magic arrows pretty easily. 

I get what you mean, and I definitely feel they should have kept some benefit for adamantine weapons. But realistically its not much of a nerf, and the hp probably makes it a buff. By the time the PCs are fighting a cr 16 monster, in almost every game, all the weapon users will have at least a basic magic weapon. And if they try to fight the iron golem at a low level before they get these weapons, its not going to matter whether the golem is immune or not, they are still going to be squashed!

Quote from theron >>

Quote from francislafleur37731 >>

how can he range attack with +10 should'not be +4  or  +12

 just yet another misprint, just roll with whatever you think is better or more fitting for the creature.

 It's based on Constitution. Its Con modifier is +5, its proficiency bonus is also +5, so you get +10

Quote from Tacky_I >>

like from minecraft?

 No. This golem heals from fire and can be pushed by attacks and takes falling damage. It also deals fire damage, has a ranged attack, and has poison breath.

Strategy: Red/gold/brass dragon, hig-level spellcaster with fire spells, or intelligent, powerful fire elemental creature has 1 or two of these. The golems act as tanks and also are in the areas of effect of their controller's attacks. You'd want a powerful controller because these guys are CR 16 (for comparison, adult dragons in the core books max out at 17, the salamander inferno master is 13, and humanoid npcs max out at 12 (an archmage would work, but the golem is still much stronger).

Edit: Have a pit fiend commander

Quote from Smiththr >>

Wait so why can't the golem just hit itself with its firebolt attack and heal itself 8d8 each round?

 Using its action to stand there healing itself while the party wails on it is a lateral move at best.

It can.  Just that since that's a ranged attack, it would make the attack rolls at disadvantage.

Quote from sigma137 >>

It can.  Just that since that's a ranged attack, it would make the attack rolls at disadvantage.

 Since the golem is trying to be hit, it would get advantage. Also, you have just been literally thinking about the rules, which is good, but could this blast itself with a beam of fire?