Specifically, I’d like to address a realm quest that is almost identical to this one: the one where you interact with a soul phylactery (the one youi sometimes give a soul!) and then it spawns 3 dudes for your realm quest.
This already exists as a mission - a mission where you interact with a chest and spawn 3 dudes for your realm quest. Except this time, you get an extra chest at the end. Why does the soul one not do this?
My suggestion is that some manner of reward is given for the phylactery variant of this realm quest. Maybe just something as small as a realm-permanent buff for the candle you’re inevitably going to do. Anything to differentiate it from the invasion chest without it seeming like, as it is now, just a “worse version of that realmquest”.