As a lot of people here know, it is often annoying that current hostiles effects, when reapplied, dont create a new effect (stack) but refresh the duration. That wotk in the same way for beneficial ones. There are some spells that trigger the Least Unstable Coil for a duration.
These spells are listed here :
Flame Shield (paladin, priest or wizard)
Zandethus' Draconic Fury (wizard)
Arkemyr's Mercurial Madness (wizard)
Cloak of Death (wizard)
Spark the souls of the Righteous (priest)
Avenging Storm (Druid and Tekehu subclass)
Pollen Patch (Druid)
For example, a SC druid with an empowered Pollen Patch get one inspiration every second (even while stationary) and, because of Brilliant from the Least Unstable Coil, can recast Pollen Patch before this last is over. The spell is always considered as Empowered and the druid become the best healer/damage dealer I played. Note I equiped him with the Weyc Wand that really often skip the recovery.
The only problem with Pollen Patch is, when an ally is down, the spell reanime him and is over.
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The best character I tryed for this topic is Tekehu as SC stormspeaker.
Empowering The Ranga at the start of the fight, with Sasha's sabre and the Weyc Wand give him the status of half-god of the storm :
Energized and Thick Grew... is already a nice synergie
Sasha's sabre refresh 3 phrases and one Empowering Point on weapon hit (The Ranga)
On scoring crit with the Weyc Wand, the seal proc per 1s The Ranga in AoE
The Weyc's Wand Follower of the Obscured skip very often the recovery for spell or weapon.
The Ranga have a correct duration and can be refreshed when needed.
ect
Of course, Avenging Storm with Effort can Chain-lightning the enemies also and for the combat duration when refreshing the spell.
This is some topics related :
https://forums.obsidian.net/topic/126433-list-of-abilities-ans-spells-triggering-the-least-unstable-coil/
https://forums.obsidian.net/topic/126859-the-weycs-items-and-pulsing-spells/
https://forums.obsidian.net/topic/126845-encore-and-refreshing-finale-for-tekehu/
https://forums.obsidian.net/topic/126689-effort-avenging-storm-the-tempest/
By the way, for the list of abilities that trigger the Least Unstable Coil, I found another two but cant edit the topic (too old) : Eliminating Blow (Rogue) trigger this effect per bullet/ target in weapon's Aoe and work with a full attack. This is possible with a rogue to gain every inspirations with this ability.
A paladin with Shared Flame could do potentialy the same.