Buff
Stormcall
Each Stormcall stack increases the damage dealt by a Champion by 5%. The number of stacks increases by 1 each time a Champion with Stormcall lands a critical hit.
A Champion can have a maximum of 5 Stormcall stacks at one time. When attacking with 5 Stormcall stacks, places a Stun debuff on the target and removes all Stormcall stacks. This Stun debuff cannot be resisted.
What the game's own status effects screen says
In the game data this effect appears as Thunder.
Champions that apply it
1 champion have a skill that applies Stormcall, according to the effect lines in the game data. This lists who applies it, not how reliably: chance, duration and resistance are on each champion's page.
The description is the game's own text. It has not been tested in battle here, and the game's wording can be loose (for example about numbers that differ between versions of an effect). See Data quality for what has and has not been checked. Found a mistake? Use "Report a problem" at the bottom of the page.