-- Shoutout for amperbee for helping me out, feel free to use part or this script as its reusable.
local GiveRings = false --Variable that handles giving rings.

addHook("MobjDamage", function(target, inflictor, source, dmg, dmgtype)
    if (inflictor.flags & MT_PLAYER) -- If Player damaged...
        if (target.flags & MF_ENEMY) or (target.flags & MF_BOSS) -- A Enemy or Boss then...
            GiveRings = true --Variable that handles giving rings is true
        end
    end
end)

addHook("PlayerThink", function(player)
    if GiveRings -- If GiveRings is true then...
        player.rings = player.rings + 1 --Player is given 1 ring...
        GiveRings = false --GiveRing variable is reset
    end
end)