GARRIKA's ability is not working in the arena as the design suggests, it is limited to only 5 quadrants wide, when used in the ARENA it stops attacking one of the side ends.
In the abilities of heroes like Enna and Voresh, the layout has the same number of quadrants used in the illustration, but suggesting that it covers an entire 5x7 area.
However, in practice it has infinite range, reaching the entire map that measures 6x8.