Less duration interaction with Holy relic

The skill "Summon Holy Relic" is not a duration skill, because no part of that skill has a duration (it also doesn't deal any damage). What that skill does is summon a minion.

However, that minion has a triggered Nova skill which applies life regen to allies for a duration.

Supports in general can apply either to skills they can affect, or to skills that create minions which have skills/properties they could effect.

Because the Holy Relic minion has this duration skill, Less Duration Support can support Summon Holy Relic, and the modifiers of the support will be applied to the relic minion it summons. No other support is necessary to allow the support to apply to to Summon Holy Relic, and when it is applying, both it's duration and damage modifiers are applied to minions created by that skill.

Summon Holy Relic has Duration listed as a "minion type" - it's in the secondary list of skill types describing what minions created by that skill can do, as opposed to what the skill itself does.

This lets the support apply to Summon Holy Relic. That's visible in-game, the support letter shows on the skill icon. If that wasn't working, there would be nothing to discuss as it would be obvious to everyone.

The fact that the support is applying to the skill means the support's stats are applied to all minions created by the skill. (some kinds of stats, such as trigger stats, don't copy to minions in that way to prevent bad behaviour - triggering a minion skill shouldn't mean all the minion's skills are now triggered and thus unable to be used by the minion. But neither of the stats on Less Duration Support fall into that exception).

Nothing deeper than that has any effect. The support is applying to Summon Holy Relic, it is not individually trying to separately support each of the minion's skills, and if it did it could not support them with only some of its stats. That simply isn't how supports or minions work.

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Sjatar wrote:

I understood it like this: Skills that summon minions has additional (hidden) tags based on what tags the minion skills the minion it can create has.

They are no more hidden than the regular types of the skill - neither are exposed in-game.

The community not working out how to interpret some of the datamined information yet doesn't indicate that it isn't there and used by the game. Community datamining cannot be relied on to be complete, nor 100% accurate (the raw data can be misinterpreted).