When you start to climb to the higher floors most people use a diamond shield of a mirrior shield. Instead of one of these two shields use a Earth Shield. When you have to fight the Krakens that do electral damage to you if you attack them have the earth shield equiped. This pervents them from damaging you on your attack turn. Use blue sands to increase the defence and in a short time you will have a earth shield equal to a diamond shield with a special abilty.