The quest reward can only be obtained after being out-of-combat for 5 seconds.
Triggering the Spoils of War passive adds +1 to the creep score of the allied champion who receives the bonus gold.
The Spoils of War passive is triggered no matter what method is used to kill the minion, but the execute can only be applied with melee basic attacks.
Assuming Timeworn Targon's Brace's user kills the most valuable minions available, Spoils of War provides:
9.4 per 10 seconds to the user, while also sharing that same gold with the lane partner.
Between 20 and 35 minutes, this is increased to 12.2 per 10.
After 35 minutes, this is futher increased to 18.7 per 10.
Assuming Timeworn Targon's Brace's user kills one minion every 30 seconds, it provides at least 6.7 health regen per 5 seconds to the user and lane partner, not taking into account the missing health ratio.
This item was an older iteration of Targon's Brace. Unlike the Summoner's Rift variant, it has a unique quest reward, but was replaced with the warding component from Sightstone to allow champions to obtain more diverse build paths.
Stats: +2 per 10 seconds, +175 health, +50% base health regeneration.
Unique Passive - Spoils of War: Melee autoattacks execute minions below 210 − 380 (based on level) health. Killing a minion by any means heals you and the nearest allied champion for 40 (+ 2% of missing health) health and grants them kill gold. Healing is halved if the owner is ranged. These effects require an allied champion within 1050 units of the user and consume a charge. Recharges every 30 seconds. Max 3 charges.
Unique Passive - Quest: Earn 750 using this item. Reward:Shield Battery, a permanent shield for 255 − 340 (based on level) health. The shield regenerates slowly when out-of-combat. Executing minions with Spoils of War regenerates 64 − 85 (based on level) shield value.