Read clan rules.
There can only be one Clan Leader at any time. However, Clan Leaders
are able to delegate their Role and assign a new Clan Leader.
If a new Clan Leader is assigned, the new Roles are changed
immediately – with the previous Clan Leader automatically becoming a
Deputy.
However, if a Clan Leader does not log into the game for 21 days,
they will be automatically demoted to Deputy, and the highest Level active Deputy
will be assigned as Clan Leader. A player is only considered active if
they have logged into the game within the last 14 days. If there are
multiple active Deputies of the same Level, the player who joined the
Clan first will become Clan Leader.
If no Clan Deputies have been active in the past 14 days, one of the
Soldiers will become Clan Leader, with the same deciding criteria as
with Deputies – first by Level, then by Clan join date if all else is
equal.
If no Clan Members fit the criteria, the next Clan Member to log into
the game will be assigned Clan Leader – whenever that may be.