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Adjusting the frequency of occasional effects?

Prince of Kitties

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Is it possible to adjust the frequency of occasional effects, such as occasional bless, haste, curse, etc.? Could, for instance, I have an item that has a 1/10 chance per turn of blessing the party, or something really nasty that curses the wielder every single turn? The ability strength only seems to affect the strength of the effect, as opposed to the frequency.


(If there's no way in the current BoE editor, maybe it should be added to OBoE...)

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  • 2 weeks later...

From the source file Combat.cpp, line 1,420:

"if (get_ran(1,0,10) == 5) {"

I read this as a 1 in 10 chance. The result of a random 1 die 10 roll must be exactly 5.

Here is the get_ran function from global.cpp

short get_ran (short times, short min, short max)


short store;

short i, to_ret = 0;

if ((max - min + 1) == 0)

return 0;

for (i = 1; i < times + 1; i++)


store = rand() % (max - min + 1);

to_ret = to_ret + min + store;


return to_ret;



If min = 0 the expression (max - min + 1) = max + 1, thus here it means 10 + 1 = 11. Thus there is a 1 in 11 chance of the occasional effect happening.

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