Start Thousand Year War Aigis Now and Get 50 Apology Stones

If you start by Thursday, October 22nd, you'll receive 50 stones as an apology for a past collaboration bug! It's enough for one 10-pull gacha, but you can accumulate your pity counter. You can also save them for the special Heroic Banner gacha on November 26th for the 13th anniversary if you don't pull. Personally, I think saving them for the Heroic Banner might be the best option. The earlier you start, the more stones you can save up by the anniversary, giving you an advantage.