Board Thread:General Discussion/@comment-64.136.203.89-20180724202142/@comment-4795804-20180826143834

1 Ray, 2 Rays, so 1 Ray of Doom, 2 Rays of Doom. When it is abbreviated to RoD, it is usually declined as if it was one regular word, therefore 1 RoD, 2 RoDs.

The same pattern for other similar cases: 1 Temple of the Monkey God, 2 Temples of the Monkey God, 1 TotMG, 2 TotMGs