Altering Death Saves

[tenaveran]

I'm working on modifying the 5E Ruleset for Pugmire, which uses the 5E SRD rules with some very small variations. Most of the variants are classes, races, feats, yatta. The only variation that really affects the ruleset is that Death Saves have a DC of 15 instead of 10. How can I go about altering the DC of the Death Save in the ruleset? I'm having trouble finding it in the ruleset files.

[Trenloe]

5E ruleset, scripts\manager_action_damage.lua line 508:

elseif nTotal >= 10 then
rMessage.text = rMessage.text .. " [SUCCESS]";

[tenaveran]

Thank You!