This is the first major Rift update!

Rift for 1.21.1-1.21.8

• Regional river, jungle, swamp, and ocean water with smooth biome transitions.
• Full tempest lighting: advancing storm clouds, stronger weather fog, wet terrain, rain-rippled water, overcast grading, and lightning flashes.
• Shadow-map volumetric godrays on High (8K) and Ultra (16K).
• Enhanced Minecraft water reflections at High/Ultra Water Quality.
• Colored held-item lighting from Low through Ultra.
• Opaque lava surfaces and dense in-lava visibility absorption.
• Rebuilt underwater scattering, caustics, motes, and sunlight curtains.
• Stabilized High/Ultra water reflections with water self-hit rejection, refined ray intersections, depth-continuity checks, and softened sampling.
• Reworked obsidian into a restrained dark clear coat and removed the duplicate reflection pass that made portal frames appear bright purple.