Mourner's gear, prayer potions, food such as pineapple pizza or even summer pie to conserve inventory space and for use when damage is taken from failing an agility obstacle, I took the holy wrench thing to help with prayer drain, duelling ring for a fast way back to West Ardougne (Mobilising Armies - spirit tree tele to Battlefield then run north is very quick, house teletab or elf crystal first to recharge prayer, then use duel ring). A weapon to kill a shadow if one starts interfering with door opening, mirror placement, etc. I didn't bother with armour, just used the mourners gear and protect from melee. Be sure to leave yourself some inventory space for the things you need to collect and also for the key and the items you can't wear in the mourners area. Read the guide well and also read this thread http://forum.tip.it/viewtopic.php?f=226&t=801730 to save yourself some frustration :D I'm sure I've left out something but it's a start.