Forge clerics serve the gods of smithing. They hold the line in plate, temper their allies' blades with a Channel Divinity, and keep a forged Spiritual Weapon fighting beside them: a second attacker in place of Extra Attack.

Blessing of the Forge
Channel Divinity · bonus action · 10 turns · level 2
Touch an ally's weapon: it becomes magical with +1 to attack and damage on top of any enchantment it already has (a +1 weapon becomes +2), the wielder has Advantage against constructs, and you add one of four riders. No concentration.

Forged Weapons
Passive · level 6
Your Spiritual Weapon gets +2 to hit, moves 12 m, sees through magical darkness and learns four new actions: Strike, Whirlwind, Flight and Teleport.

Smith's Insight
Passive · level 1
You know how things are made: Advantage on all attack rolls against constructs, spell attacks included.

Divine Strike: Thunder
Toggle · free · level 8
Once per turn, a weapon hit deals an extra 1d8 thunder damage, weapon cantrips included.