Self Stun not working

First and foremost, Stun Threshold is based on a character's effective max life, which is why a 1 HP Chaos Inoculation cannot self-stun themselves with any kind of damage, without considering than having more than 0 ES means to have a natural 50% chance to avoid being stunned. However, since this character use Valirium and Gluttony, stun is based on effective ES, which is low enough to not matter, and ES will always be 0 so no 50% chance to avoid stun will work here.

From wikia

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Although reflected damage hits, it intentionally doesn't trigger most on/when hit effects[4] and, accordingly, cannot cause status ailments[5], stun[6], critical strikes and other similar effects that require a hit. Reflected hit, however, is able to yield a flask charge if the Flagellant's prefix is present there.

So self-stun would not work with, say, Hiltless' self-reflect

For the specific Scold's Bridle interaction:

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Scold's Bridle's unique modifier causes the player to take physical damage whenever mana is spent. This includes mana spent at every stage of a channelled skill. The damage is secondary damage[1]. The amount of damage taken from this effect is affected by physical damage reduction, such as from armour or endurance charges, as well as modifiers to damage taken, such as from Fortify or Oro's Sacrifice.

The question now is: can Secondary Damage stun?
We know "Secondary Damage" is, together with "Attack" and "Spell", one the four sources of damage and, specifically, together they are only three that can hit (the fourth, DoT, never hits). Since they hit, they are capable of stun

Fortunately enough, GGG comes to aid when Wikia cannot. And here we have a post for Mark_GGG from 2015 stating that self-stunning is not possible:

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Stunning yourself is not a valid action in the game engine, because under normal circumstances it can lead to infinite loops. There are explicit warnings that occur if it happens, so we can fix it. Scold's Bridle happened to avoid the infinite loop until crash because of a timing technicality, that doesn't mean it's safe to leave in long term.

On of the base rules we have to have as a consequence of how damage works is that players are unable to stun themselves with damage.

I'm not qualified to comment on balance concerns (there may have been some as well), but any time I'm told something can stun itself, I know something needs fixed.

So... no dice. Pretty much everything that touches you will stun you, but you cannot stun yourself and, judging by Mark's word back then, if they kept up that spirit this will never happen if not by mistake

EDIT: Actually, 1.3.1 covered the Scold's self-stun mechanic:

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Fixed a bug where Doedre's Elixir and Scold's Bridle could stun the player.

Thankyou Maxtrux. That answered why it was not working. It kind of sucks that we suffer through channel skills locking in channel without button press and CwDT auto triggering from self damaging mechanics, but we cannot self stun.

I knew someone would be able to answer :-)

it's nothing, ragnov. It just took some research on wikia and forum, and I've learned something new along the way

If I may however, CwDT from self-damaging would be way more bearable for a server to deal, because of the cooldown of CwDT.
The server would have to do an action (trigger a skill) at worst 4 times per second (0.25 cooldown)
On the contrary, self-stunning every time a character self-damage can yield to a lot of self-hits. Think about a Gluttony and a 38 attack-per-second Cyclone, and Gluttony damaging you 38 times per second. Sure, of course you will now (since 3.11 and assuming you don't seek out stun avoidance) not be able to use 38 times stun because of the time you will lose in being stunned, but you get the point

The gluttony should only trigger when you first use cyclone since it is damage when you use a movement skill. Since you can keep channelling cyclone it should count as only one hit for as long as you channel it. The reason I was looking at cast on stun is that there is no level cap on the triggered skill so it supports way higher gems that you can trigger(granted not all the time). With the ring and nothing in ES early you can trigger it at level 38 low level with minimal investment.

The reason why I was looking for self triggering is that some bosses(Atziri) have phases where minions walk to them healing them and ignoring you. It would be nice to trigger the invested skill selection during those instead of ignoring 75% of your DPS and watching her heal back up.

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ragnov wrote:

The gluttony should only trigger when you first use cyclone since it is damage when you use a movement skill. Since you can keep channelling cyclone it should count as only one hit for as long as you channel it. The reason I was looking at cast on stun is that there is no level cap on the triggered skill so it supports way higher gems that you can trigger(granted not all the time). With the ring and nothing in ES early you can trigger it at level 38 low level with minimal investment.

The reason why I was looking for self triggering is that some bosses(Atziri) have phases where minions walk to them healing them and ignoring you. It would be nice to trigger the invested skill selection during those instead of ignoring 75% of your DPS and watching her heal back up.

when you get stunned you will stop channeling therefore as soon as the stun expires and you are holding cyclone, it would just cast it again, so it would work, but it just doesnt stun you so