Tip for Relic Shield Supports
Since Relic Shield heals both you and your ADC, you should ONLY use it on the first Melee immediately. After the timer on it is engaged, just wait for another melee later. By then, the healing effect won't be wasted.
Moreover, know the timings for the Siege minions and Melees so that you save a Relic charge for it as much as possible. If you've used Relic on Rangeds then you're starving yourself.
Lastly, let your team know that you have the item if they're just blowing all their waveclear in situations with no urgency and while you have charges. I've seen too many teams starve their supports mid-late when there are no objectives on the map and there's absolutely no reason to let the fully stacked Targon's+ sit idly.