Fire Absorption. Whenever the bronze bull is subjected to fire damage, it takes no damage and instead regains a number of hit points equal to the fire damage dealt.

Immutable Form. The bronze bull is immune to any spell or effect that would alter its form.

Magic Resistance. The bronze bull has advantage on saving throws against spells and other magical effects.

Magic Horns. The bronze bull's Gore attacks are magical.

Multiattack. The bronze bull makes two Gore attacks and one Horn toss.

Gore. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 25 (4d8 + 7) piercing damage.

Horn toss. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 5) piercing damage; the target is thrown (1d8 * 5) ft in a direction chosen by the DM and takes bludgeoning damage from the distance thrown according to the rules for falling, and is knocked prone.

Charge. If the golem moves at least 20 feet straight toward a target or targets, it makes a Gore attack as its first attack. If the attack hits, it deals an additional 12 (2d8 + 3) piercing damage, and the target must make a strength saving throw or be knocked prone. The DC of the saving throw is equal to the distance charged minus 10; e.g. if it charged 30ft, the DC would be (30-10) = 20.