Clash is a competitive team-based tournament system that rewards players for organized play.
The alpha tests premiered in late 2017 for Vietnam. An official beta launched on December 15th, 2017 onto EU servers, with team creation enabled prior on December 12th. The original release date was set for May 2018, but due to frequent crashes and development issues, it was delayed indefinitely. On August 19-25, 2019, NA conducted another test, and the second official beta was conducted across two weekends of December 7–8 and December 14–15, 2019. The second official release date was February 22-23, 2020. EU servers had their release dates pushed back for February 29th and March 1st due to another slew of server crashes. 
- Summoner level 30 or more.
- Completed provisional matches in at least one ranked queue.
- SMS account verification (lasts 6 months).
Entry into a bracket requires Clash Tickets that can be bought with 990 or . A player can instead submit a Premium Ticket bought for to be eligible for more prizes upon victory in the tournament. A player can also submit a ticket on behalf of a teammate without one. 
Teams are organized by a captain who decides the name, tag, and. The team's tier adjusts based on the rank composition of its members.
In case of emergency, a player can be substituted for a single day, but only after the lock-in phase begins. The substitute must be in the same skill tier, and may only submit one ticket. The substitute receives rewards normally, while the subbed-out player receives losing rewards.
If the team wins the bracket, the subbed-out player is reinserted into the team for following brackets.
The subbed-out player can reclaim their position on the roster before the scouting phase begins.
1. Lock-in phase
The entire team must lock-in within 30 minutes of match start; otherwise they will not participate, and their tickets will be returned.
2. Scouting Phase
Teams are presented with information about the rival team to make decisions on pick/ban strategy. This phase lasts 7 minutes.
3. Champion Select
Champion select follows the tournament draft, where all champions are unlocked.
A player that has not locked in will be given a random champion, if not their hovered champion.
Matches are done in a 8 team bracket, i.e for 3 matches.
Pauses & Remakes
/remake are disabled in the Clash so matches cannot be overrun or be remade to prevent extended days of play. There's a potential for griefing or trolling through abuse of these features.
After 60 minutes, towers will become more fragile and easy to push. By 65 minutes, structures will start to damage themselves at a fixed rate in order (towers in order, then inhibitors, then nexus turrets, then the nexus). By 70 minutes, one team will have won the game, decided by random if neither team damaged a structure. These measures are to keep match times at fixed lengths so operations are scheduled smoothly.
The winning bracket will reward an exclusive profile icon, as well as a tournament trophy of the sized bracket.
Players gain Victory Points (VP) depending on the tier their team plays in, as well as their personal ticket entry. VP can be used to unlock team icons, and banners that will display in both the player's profile and their chosen lane on Summoner's Rift.
Orbs & Capsules
Exiting the tournament awards the player a Clash orb or capsule, depending if they bought the Premium Ticket or not, with prizes depending on their placement, with a guaranteed new Clash logo.
|8th||3-Win XP Boost|
|2nd||Skin Shard + Skin Shard|
|1st||Permanent Skin Shard + Skin Shard|
These are the default flags used.
Used in the Hextech Cup events.
Used for the Hextech Cup events.
The initial release would allow 5 Tickets to be submitted for premium entry. Before the initial release date, a promotion website was published that introduced the feature and awarded a Free Clash Ticket for players.
- Clash is commonly referred to as "Crash" by the community, due to the tournament system constantly crashing every time it was re-released for the community.
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