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Relic Approach is the mission that gave me a lot of troubles to have it finished on Legendary difficulty and Gold medal at the same time. Skip cutscenes to 02:42
My goal is to make a playthrough with completing as many bonus objectives, skulls, black boxes as possible.
With wrong strategy, you will have a lot of casualties + you will be stopped by the Covenant near the force shield.
In result, your combat and time bonuses will be too low to reach the 70000 points bar.
Except Mission 14, it's the only mission that might be very problematic to get the enough score which grants the Gold Medal.
Approach the second Covenant base from the west, do not let the Hunters destroy your tanks and Warthogs.
You need the 3rd Tech Level to upgrade Scorpions to use Canister Shells, after it you may want to sell the Reactor.
Keep the casualties at minimum and use your time wisely, it's the key to get the Gold here.
And don't forget to pick up the Black Box near the Refinery + Skull near your main base after killing 20 Jackals.
Big thanks to the Bulldog Team ^.^