Animated Spider Construct

The Animated Spider Construct can be made as default, or as a reinforced version which will have an average hit point count of 8, and a roll of 2d4 + 4.

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The Spider Construct becomes animated when the Animate Objects is cast on it. Up to three spiders can be active per day. The Animate Objects spell resets to 3/day every undisturbed long rest.

The Heat Metal spell can be cast upon the Animated Spider Construct. Upon cast, the Construct takes 2 fire damage. It will then take 1d4 + 2 damage per turn, at the beginning of each turn.
Any creature that the construct touches takes 1d4 + 2 burning damage, or 1d8 +  2 burning damage if the d20 AC roll penetrates the opponents armour. This penetration fire damage will scale by 1d4 each new level.

Latch. Launches at an opponent and pierces into their armour, staying till removed by an ally or by will.

Melee Weapon Attack:  +4 to hit, reach 10 ft., 1 target. Hit: 4 (1d4 + 2) piercing damage. 

If removed, the creature takes 2 bleed damage for 3 rounds at the start of each round, or until a healing spell or potion is used.