I’m pretty sure this was my first proper concept theme back in the day. Before some smartarse comments... yes I’m aware we have a "Wisp" frame already, even if that Warframe doesn’t really have anything resembling a theme and is instead more a bunch of random ideas glued together with big numbers to make it work.
Anyway here’s the concept. Willo's kit is heavily themed around how actual Will o' the wisps functionned. in reality they were self igniting methane gas in swamps (wihch can explode) their flames lured travellers off the road and ultimately to their doom in bogs or marshes which then lead to ideas of ghosts or malicious spirits being responsible for the phenomenon.
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Passive: Willo gains invisibility for 5s and then becomes visible again for the next 5s repeatedly.
1: Wisp
Cast to produce a Wisp spawn location.
Wisps are stationary but will move towards enemies that enter their range of 3m (fixed)
Wisps explode after a few seconds of contact with enemies, dealing 20% of the enemy’s current health as blast damage. Range of explosion is affected by range.
After exploding Wisps will respawn after a few seconds in their spawn location provided there are no nearby enemies within 8m (fixed) of the spawn location. (Spawn time is affected by duration)
Seven wisps can be produced from any given spawn location before it expires affected by power strength shown visually based on a ring around the spawn location. Five Wisp spawns can be active at a time.
2: Mist
Mist covers the ground in a relatively small area around the point of casting, 4-8m. Enemies entering the mist are dealt minor Cold Damage with a strong chance of a status proc.
Allies inside the Mist do not suffer Status Procs and any existing status procs are removed on entry.
On cast Mist is also produced from any active Wisp at half range.
3: Seeing Ghosts
Releases spectral figures which wander around the Warframe and which are attracted to enemies. Ghosts attract enemy fire and deal Cold damage to enemies they pass through.
Enemies passed through by a Ghost are vulnerable to friendly fire.
On expiry or holding the ability Ghosts release a spectral scream which disorientates/staggers enemies briefly.
Three active ghosts can be summoned at any time.
4: Isolation
All enemies in front of the Warframe (same targeting system as Ember ultimate) suffer isolation and become unable to see or attack you and your allies. Enemies within a fixed 10m plus the active range of Wisps will be attracted to the nearest one.
If a Wisp explodes on an enemy then that enemy is “Feared” for a short duration. Enemies receive a movement speed buff and the attract range to Wisps is doubled to 20m then 30m. The duration of Isolation on any individual enemy is increased/reset for every time a Wisp explodes on them and the damage dealt by wisps also doubles each time for a maximum of 60% Hp damage.
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The playstyle of this Warframe revolves around diverting enemies via a system of rotating crowd control. Terrifying enemies and leading them to Wisps repeatedly to deal damage while avoiding taking damage yourself.
I chose to make the Wisp spawners only produce a number of wisps before expiring because otherwise it would be free damage. I could have made them explodefor Gas damage, but blast seemed more appropriate and maybe more effective here. The overall effect of the kit would remain the same regardless though.
The Mist causing cold damage essentially functions as a bottleneck, allowing you to group up more enemies at once to be damaged by the Wisps. The resetting status effects was a tiny reference to Pokemon and is a decent non game breaking defensive buff. Not considering synergy with the Wisp spawners this is essentially a Cold damage version of Oberon's 2 with slightly reduced range and 360 degree radius.
Ghosts are temporary CC and have the least synergy of the overall kit. I had considered making them produce Mist instead of the Wisp spawn locations but I perferrred it the way it is.
The ultimate was just a way to tie in the whole theme and activity fo the 1 and 2 together to create what is basically a conga line of death with a group of enemies being feared, lead to a nearby Wisp, damaged by it exploding and then being attracted to another wisp and dealt even more damage on subsequent explosions.
As always constructive criticism is appreciated. I hope someone likes this theme. it's a pity we'll never see anything like it because of the actual Wisp...