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Put as little burden on them as possible and make sure you can take care of yourself. Yes, the host can heal you with their Estus Flasks, but your job isn't to rely on the host, it's to assist the host. Other options include having a lot of backup Humanity (the consumable item), a Sanctus shield for stretches where you are just travelling through the level, or using the Ring of the Evil Eye. This typically means investing in enough attunement and faith to at least cast the miracle Heal. Remember, you only benefit from assisting if you survive to the end, so make sure you're actually prepared for what you're trying to help with. Don't attempt to help a host fight Chaos Witch Quelaag without any Purple Moss Clumps for the journey there, don't go into the Moonlight Butterfly without magic or arrows, and please do not try to help with the Centipede Demon without an Orange Charred Ring. Second is that if you leave it right in front of the boss area, then hosts are more likely to summon others who have placed their sign earlier in the level instead of you. The first is that hosts that would need help with bosses have a greater chance of dying on the way to the boss area and losing their human form, and thus their ability to summon you. With only a few exceptions, it is better to help the host through as much of the level as possible for a couple of reasons. The most likely possibility of getting summoned at the boss arena instead are by hosts that have survived through the level but lost summons along the way, and who want to summon replacements without backtracking all the way to the bonfire. As a general rule, place your sign as close to the first bonfire before the boss area as possible.
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After some initial pointers there will be a break-down of each area by boss (since the point of co-op is to help the host defeat a boss), stating what levels are found to be the best to be summoned for that particular area and why or why not some bosses are better for being summoned than others. You may also find it somewhat useful when looking to get summoned for dueling via the Red Sign Soapstone or Dragon Eye, but are probably better served looking for a guide focused on PvP rather than co-op. Other players interested in learning how best to summon others for help or to be summoned to farm souls/humanity or just for fun may also benefit. Note: These methods were initially established to make characters able to join and progress in the Warrior of Sunlight Covenant, so those of you following this covenant will likely benefit the most from this guide.
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