Seasons

Seasons refers to the Thread-spanning attack modifiers that many OPs implement to simulate the passage of time across Threads. Usage is common, but not all OPs bother to implement Season rules.

Autumn
Starting in the second thread, and continuing until its end, Autumn applies a Siege Difficulty decrease of one to all strongholds. An alternative way to express this is a universal Siege buff of one (+1S) to every player. Even typically immune strongholds like King's Landing and Braavos are subject to Autumn. If a second Autumn is reached (Thread #6) the decrease may be changed to -2.

Winter
Starting in the Third thread, and continuing until its end, Winter applies a Territory penalty of one (-1T) to every player. If a player rolls a 1, then one territory is reverted to neutral white. If a second Winter is reached (Thread #7) the decrease may be changed to -2T.

Spring
Starting in the Fourth thread, and continuing until its end, Spring applies a Territory bonus of one (+1T). If a second Spring is reached (Thread #8) the increase may be changed to +2T.

Summer
Starting in the Fifth thread