Vampire disease has four stage and it doesn’t hurt till it’s in the fourth stage. As a vampire, you will experience both beneficial and detrimental changes depending on your current stage.

The longer you go without blood, the more extreme these changes become. When you start receiving this message “You feel a strange thirst come over you” at sunset, people will start attacking you at sight.

When you’re at the summoning circle problem may occurs such as Falion is there but he do not have option to start quest. That is because he is not standing at the spot where he should be.

If this were to happen, check what’s hindering him from standing at the summoning circle. If there’s a dead crab corpse or a live one, kill and dispose it far away.

If he is still not moving, equip a shield and try to push him to the circle. It is also advisable to save the game in different slot before Falion goes to the summoning circle so that you can just reload the save and maybe this bug won’t occur.

* note :

You need to drink blood in order to stay at phase 1. As time past by you may not be able to do it with low stealth skill. Calm skill will make hostile npc stop attacking you within a frame time. This would be helpful if you need to speak to any NPCs.