from typing import Any

UNSET = object()


def recursive_merge(*dictionaries: dict | None) -> dict:
    """Merge multiple dictionaries recursively.

    Later dictionaries take precedence over earlier ones.
    Nested dictionaries are merged recursively.
    UNSET values are skipped.
    """
    if not dictionaries:
        return {}
    result: dict[str, Any] = {}
    for d in dictionaries:
        if d is None:
            continue
        for key, value in d.items():
            if value is UNSET:
                continue
            if key in result and isinstance(result[key], dict) and isinstance(value, dict):
                result[key] = recursive_merge(result[key], value)
            else:
                result[key] = value
    return result