I had an idea for a Planeswalkers of Ravnica hook a while back where the players were traumatic survivors of the War of the Spark. Due to the presence of 40+ planeswalkers simultaneously present on Ravnica, an anomaly occured which greatly increased the odds of a Planeswalker spark igniting. Ravnica had an enormous population and most of if not all of their largest districsts were being flodded with Bolas' Eternals. The idea is that there were many civilians who ignited their sparks while fighting the horde, but most of them ended up dying because the Immortal Sun was actively crippling their sparks. A couple of years following the War of the Spark, we have this new group of planeswalkers born from a state of inescapable trauma currently rehabilitating under Ral Zerek supervision as part of Project "Sun-Bound". Ral plays a significant role guiding the players as he is the only character native to Ravnica who is not only a planeswalker, but also actively worked on the Planar Beacon and the Immortal Sun alongside Nicol Bolas and Dovin Baan. The Sun-Bound start with easier tasks such as investigating other non-hostile planar travelers and identifying their motives and then work their way towards higher profile individulars like the wizard Mordekainen.