Well, we just need 1 more ender eye and we're ready to go.
I've collected food (melons and breed), snow golem ingredients (snow blocks and pumpkins), potions of poison, weakness, slowness, harm, healing, strength and speed (mostly splash potions), a stack of sticks, 3 iron swords, 1 punch enchanted bow and a stack of arrows. I also have 1 blaze powder stored in my private chest in case someone found an ender pearl but forgot to make it into an ender eye.
However, we still need coal for heaps of torches and cobblestone for shelter. Maybe Croxis will disable the destructive ability of the dragon, which can basically break through anything except those obsidian towers.