DEPRECATED - see post for details.
When you choose this domain at first level, you adopt a particular style of fighting as your specialty. Choose one of the following options. You can't take a Fighting Style option more than once, even if you later get to choose again:
At first level, you additionally gain proficiency with martial weapons.
Starting at 2nd level, you can use your Channel Divinity to grant a powerful benediction to one of your allies.
As a bonus action, touch an ally with your holy symbol - for one minute, whenever that ally makes an attack, they may choose to invoke your blessing, adding a d4 to both the attack roll and damage roll of that attack. They may only invoke this blessing for one attack per turn, but may do so after the attack roll has been made, as long as the outcome has not yet been determined.
Beginning at 6th level, you can attack twice, instead of once, whenever you take the Attack action on your turn.
After you reach 8th level, your weapon attacks deal an additional 1d6 radiant damage.
Starting at 17th level, whenever one of your allies successfully melee attacks an enemy that is within the reach of a weapon you are wielding, you may expend your reaction to make one weapon attack against that target.
While none of the individual abilities are out of line with other domain features, I'm concerned that it might be a bit too focused a package - Extra Attack in particular is a bit strong, though I feel that its inclusion in other full-caster archetypes makes it fair game. The goal is to make something comparable to the War Domain, but more focused on offense than defense. Also, I feel that the cleric (the most melee of the full-casters) deserves to have an Extra Attack archetype, since the Wizard and Bard both have one, and the Moon Druid's Wildshape give him Multiattack.