If you use Shadow Movement to sneak into houses and a pegasus team to pull the flying sleigh... yes, in this world, it's possible to become Santa Claus! But... the Christmas tradition doesn't even exist in this world. When Rimuru tries to explain it in detail to the people of Tempest, they end up summarizing it as a "party." The Christmas cake and presents are ready, and most importantly, Kaijin and the other Dwarves create gorgeous decorations that bring the Christmas mood to Tempest. On top of that, Eren and the children treat everyone in town with their heavenly singing.
the bright lights of a bustling 
city cause unrest in my heart.
أضواء مدينة مُزدحمة برّاقة تسبّب قلقاً في قلبي
ist das Gefunkel der Stadt
también anhelamos
las luces de la ciudad.
también anhelamos
las luces de la ciudad.
je suis distraite par les lumières
le luci della città in festa
aquele brilho da cidade tão animada
поэтому яркие огоньки города…
сеют в моём сердце тревогу.