Bioferr

Giant Brute. The bioferr can wield weapons with the two-handed property with a single hand. Additionally, all attacks the bioferr makes with a melee weapon do 1 extra die of damage (included in the damage statistic).

Mechanical Resistance. The bioferr has advantages on all saving throws made against being poisoned. The bioferr is additionally immune to disease and cannot be magically put to sleep.

Devil's Steel Plate. The bioferr's armor is a suit of devil's steel plate welded into it's form. The armor gives resistance against all non-magical slashing, piercing, and bludgeoning damage not dealt by a devil's steel weapon. The armor cannot be forcibly removed.

Tireless machine. The bioferr does not require sleep, but does need to spend at least 4 hours each day in a deactivated state to avoid exhuastion. In this deactivated state, the bioferr still has use of all of it's senses and can perceive things with it's passive perception, but cannot move or otherwise act.

Repair. The bioferr does not regain hitpoints from being deactivated, but can regain 1d4 + 3 HP every time the mending cantrip is cast on it. Additionally, somebody proficient with smith's tools can make a DC 13 ability check to repair the bioferr. The bioferr returns to its max HP on a success and to half of its max HP (or remains at its current HP, whichever's higher) on a fail. In either case the check takes 1 hour to complete and can be performed during a short or long rest.

Magical Absorption. When the bioferr takes magical force, lightning, fire, radiant, or thunder damage after being hit by a spell that targets only one creature, it makes a Constitution saving throw equal to 10 plus the spell's level. On a success, the bioferr takes no damage and gains HP equal to half the damage it would have taken. On a fail, the bioferr takes half damage. Additionally, the bioferr has advantage on all saving throws against spells and magical effects.

Magical Essence. The bioferr's primary life source is composed of magical energy. The force can be detected by spells such as detect magic, but cannot be dispelled with [spell[dispel magic[/spell]. If the bioferr enters an anti-magic field, it's life force is temporarily suspended by not destroyed. If this happens, the bioferr takes the paralyzed until it is removed from the anti-magic field.

Longsword. Melee Weapon Attack: +12 to hit, reach 10 ft., 1 target. Hit: # (2d10 + 8) slashing damage. 

Redirect Blast. The bioferr, upon being hit by a blast of magical force or lightning energy delivered by a spell of 1st level or lower, may choose to use its reaction to instead redirect the blast at another creature or object in sight. The attack against the new creature or object has the same hit and damage values as the attack made against the bioferr.