I combined my ideas with yours and GW's, and it resulted in a much stronger solution for Triumph.
It turns out that your custom template was exactly what I needed! There is no one template that can carry all three Triumph effects! I borrowed some of GW's ideas, intergrated it with my AI tinkering, and used your template.
The result: Triumph works as originally written. It is a synergy of Battle Standard, and occupies its own slot on the skill tree. The -resistances and -damage work exactly as written. It is no longer necessary to extend them to general reduction effects to get them to work. The AI is much more consistent with casting Triumph. It always does it four seconds after being summoned, and cannot turn it off. It was not necessary to add a lingering duration to the effects of Triumph. When a monster enters the AoE, it gets the debuff. When it leaves, the effect stops. It works like Rally, except that it affects foes instead of friends.
I did all of this by stacking three different skills together. There is the Battlestandard_Petmodifier_triumph file, which defines Triumph as a secondary skill to Battle Standard. There is a new file called battlestandard_petskill_triumphBuffRadius, which sets the rules by which the AI can trigger the Triumph spell, but does not contain the actual Triumph effects. The effects are contained in battlestandard_petmodifier_triumph, which has been changed to use your new template.
The only bug left is that the banner still sometimes does damage to monsters that get very close. I call this the "flesh eating banner bug," and still don't know how to fix it. All the same, this is real progress.
I attached the raw dbrs. It would be good if you and GW and anyone who is interested could do some field testing and offer suggestions.
I don't know anything about Control-Alt-Support's Triumph mod. How does it work?
If a understand you correctly, you split RoT into a separate skill from Deathchill Aura. I think that this is a fine solution, especially since it looks like RoT and DCA need to have separate templates to work properly.
I'm glad that you like the Nymph tweak
