Tin Crystallization Catalyst for normal sorceries and Manus Catalyst for Dark sorceries. Upgrade strength a lot for dark sorcery build. Run up to bosses and get under/close to them. Use as many dark beads as possible once close and boss dies in seconds. Also use homing Crystal Soulmass constantly when fighting Gwyn. It’s an easy cheese strat. Just use it right after entering boss room and put up shield. Continue this every time he misses his attack and he’ll die in like 3+ hits