1. Go to the Moonlight Coast, find the Gravekeeper, and do some pre-quests (graveyard quests) to get a quest. Presumably, it can be completed by finding the Dragon King and talking to him. The reward has a temporal shield + a dark shark map scroll. This is the easy way to get the shield. Because the graveyard quest is mandatory.

2. You should have the impression that every time you fight the F4BOSS, the boss will drop a scroll, such as Sea Tide Roar A ......, that scroll, can take you into the place where the demon soul stone is dropped, that place has a time limit. When you go to Sea Tide Roar, there is a hidden mission, probably telling you to fight soul stones to him, at this time, the chances of soul stones coming out will be greatly improved, you can fight up to 20, and then in the abandonment of the mission, and so on and so forth. Then look for the Dragon King to exchange items.