Ten Day Ultimatum

Fixed

• Heavenly Beasts no longer become visible during the final two seconds of the summoning animation. The entity model, floating custom name, and boss health bar now remain fully hidden for the entire six-second ritual and appear together only when the final burst completes.
• Persisted awakening rituals now always restore full invisibility after reloading, regardless of how little ritual time remains.

Changed

• A Heavenly Beast's area pulse now applies Darkness only on its first combat pulse. Later five-second pulses retain the roar and knockback but no longer repeatedly obscure every nearby player's vision. The one-time Darkness state persists across save and reload.
• Increased Echo Altar density in newly explored End Land terrain from one deterministic candidate per 32x32 chunk region to one per 16x16 region, making altars four times as common and roughly 256 blocks apart. Previously generated terrain remains untouched.
• Heavenly Beasts are now hard-bound to their summoning altar. Beyond 42 blocks they abandon distant targets and path back; beyond 48 blocks they immediately return to the altar center. The altar origin persists across saves, and awakening entities remain fixed at its center.