A large portion of relevant modules/templates have now been switched to cargo. Various usages of SMW throughout the wiki need to be replaced by the new functions, in particular item tables. If some pages do not show up but contain no errors, please null-edit them. To see how you can help with the port check out Path_of_Exile_Wiki:To-do_list/SMW_migration (and leave a comment on the talk page if you have questions).
Blast Radius is a notable passive skill that grants increased area of effect for skills. It also grants increased damage for any area of effect component of skills that deal damage. It's located on witch's section of skill tree near alchemist, arcane focus and lord of the dead