Spiritual Beast EXP (300,000 needed to activate one beast) sources: Resource tiles (luck): tile 11-12 = 5,000 EXP, tile 8-10 = 1,000, tile 4-7 = 500; none from tiles 1-3/13-15. World Boss single-hit-damage ranking: top1 = 100,000 EXP, 2-5 = 50k, 6-9 = 40k, 10-20 = 30k, 21-49 = 20k, 50-98 = 10k, 99-100 = 5k. Kill bosses (luck): normal Werewolf L5/Manticore L6 = 1,000; Yasha L7/Peryton L8 = 2,000; Minotaur L9 through Fafnir L13 = 5,000. NONE from Zombie L1-Skeleton L4 or from Behemoth L14/Phoenix L15/Jormungandr L16/Typhon L17. Event bosses: Royal Thief = 2,000; Lava Turtle/Golem/Witch/Warlord L1-5 = 5,000; Hydra L1-4 = 5,000; Cerberus L1-3 = 5,000; Ymir/Nian L1-5 = 5,000; Garuda L1/2/3 = 15k/30k/40k. Not from Fenrir, Bayard, Viking, Pumpkin. Relics Chamber (luck) = 100,000. Black Market = 1,000 EXP x5 for 1,000 gems, x10 for 2,000 gems. Bot note: farming mid normal bosses (Minotaur L9-Fafnir L13) doubles as steady beast-EXP income.
Original research source: Evony Guide Wiki