Rare Trident & Axe

• Elder_guardian has ...% chance to drop a rare Trident. (random_chance_with_looting", "chance": 0.025, "looting_multiplier": 0.01)
• igloo_chest has 50% chance to hold a rare Trident.
• buried_treasure has 5% chance to hold a rare Diamond_axe.
• end_city_treasure has ~3,5% chance to hold a rare Diamond_axe.

2019-06-05 working on Minecraft 1.14.3 pre1