[MC-47091] Slimes, Magma Cubes, Ocelots, and Iron Golems don't use generic.attackDamage Attribute

The bug

Slimes, Magma Cubes, and Iron Golems fail to use the generic.attackDamage attribute properly, meaning that their attack damage cannot be altered via commands or potions. This is the cause behind MC-5164 and MC-9600, and may also be related to MC-33285.

As a result, the following command will only work properly for melee-capable mobs which aren't affected by this bug:

summon MOB_TYPE_HERE ~ ~1 ~ {Attributes:[{Name:"generic.attackDamage",Base:10D}]}

Most melee-capable mobs, such as zombies, will deal exactly 5 hearts per hit on Normal difficulty. The mobs affected by this bug will instead deal their usual damage.

In addition, Strength and Weakness potions have no effect on these mobs.

Steps to Reproduce

Spawn a slime, magma cube, or iron golem (don't use a golem built manually from blocks; they don't become aggressive).
Allow it to attack you, and take note of the damage dealt.
Splash it with Strength II, or any desired level of Strength or Weakness.
Observe that the damage dealt is the same as before.

Technically this issue also applies to the Ender Dragon, but essentially no potion effects or attributes work on the dragon anyhow.

Affected entities

Affected entity	Note
slime
magma_cube
ocelot	attacking chicken
villager_golem

Linked issues

is cloned by 1

MC-165508 Magma cubes still deals damage when their generic.attack_damage attribute is set to 0 Open

Comments 24

alexzombie04 2014-08-16T00:10:02Z

confirmed

John Smith 2014-12-22T22:22:41Z

Still relevant in 1.8.1-pre2, and also affects Killer Bunnies.

Steven W.d.V. 2014-12-24T21:20:56Z

Also with Zombie / Skeleton

Steven W.d.V. 2015-03-21T17:59:32Z

Actually, sometimes is does partly work

marcono1234 2015-05-23T15:37:40Z

Confirmed for Slimes for

1.8.5 probably caused by the fact that their Size tag determine Health and AttackDamage (and it gets applied after the attributes are set by the command)

14 more comments

Steven W.d.V. 2015-09-23T15:13:59Z

Seems to be fixed except for Slimes.

Cam 2015-10-27T05:52:13Z

Confirmed in 15w43c

/summon VillagerGolem ~ ~1 ~ {Attributes:[{Name:generic.attackDamage,Base:-10}],ActiveEffects:[{Id:18,Amplifier:255,Duration:199980}]}

/effect @e[type=VillagerGolem] minecraft:weakness 1000 255 true

Avantir_Yihn 2016-01-29T00:44:53Z

Confirmed for 16w04a.

TheMrZZ 2016-02-04T20:42:51Z

Confirmed for 16w05a

Steven W.d.V. 2016-02-05T20:26:45Z

Confirmed for 16w05b

Steven W.d.V. 2016-02-18T18:06:45Z

Confirmed for 1.9-pre1 and 1.9-pre2

SunCat 2016-03-19T12:14:12Z

Still in 1.9.1-pre3, fixed for wolves

SunCat 2016-05-08T07:51:09Z

Still in 1.9.3-pre3

elrichmc 2016-06-27T16:33:09Z

Still in 1.10.2, tested with slimes.

Wyatt Boyle 2016-10-23T20:23:00Z

In the latest snapshot, 16w42a, the damage is still the same when following the instructions posted. Yet when using the command

summon MOB_TYPE_HERE ~ ~1 ~ {Attributes:[{Name:"generic.attackDamage",Base:10D}]}

they do not attack any harder than normal, YET when I attack them, they produce what looks to be 5 full hearts or so of damage, and no matter the size, they will not die on the first hit (I hit a tiny slime and it produced the large amount of hearts, and did not die when I hit it), upon hitting them again they will go back to normal behavior, of course still not dealing any extra damage to me (yes I tested it on a slime that could deal damage to me as well)

marcono1234 2016-11-26T14:53:00Z

Wolves are no longer affected in 1.11, keep in mind that their attack damage resets when they are tamed

Jayceebee 2017-08-05T13:59:51Z

Confirmed for 1.12.1

qwerty23495 2018-06-25T21:02:35Z

Does this still affect the current versions of Minecraft? (1.12.2, 1.13-pre3). If so, please update the ticket accordingly.

Steven W.d.V. 2018-06-29T20:19:05Z

Confirmed for minecraft:iron_golem with 20D (doesn't kill you in one hit while zombies do)
In 1.13-pre5 by the way..