One of them is the A Hard Rain Falls quest that will be given to you by the Exo-Stranger, the elusive figure that's been a part of the Destiny canon since the very first game back in 2014.
This is a relatively short quest but the reward is pretty worth it, so here's a quick guide to help you finish it.
How to complete A Hard Rain Falls quest
Step 1 - Complete Public Events and Patrols in the current Eclipsed Zone
While we don't know exactly how Eclipsed Zones will change the current Europa landscape, we do know that the current one at the moment is Eventide Ruins. So head out north and start doing some public events and patrols.
You can speed up the process by defeating powerful enemies and running heroic public events. If you don't know how to turn the newest public event added with Beyond Light into a heroic version, check out our guide right here.
Step 2 - Talk to Exo-Stranger
Simple as that, once you completed the first step, Exo-Stranger will hand you a new sidearm, the High Albedo.
High Albedo Sidearm
The sidearm boasts an adaptive frame, which will make it fire a 3-round burst, and can drop with some really good perks.
Mine came with Demolitionist and Surplus, making it a hell of a combo, as Demo recharges my grenade energy faster, taking huge advantage out of Surplus' buff, which grants me handling, reload speed, and stability for each fully charged ability.