"The first child chain of the Ardor platform is called ‘Ignis’. Ignis will inherit all features found on the Nxt blockchain. These features will also be available on other child chains, though restrictions can be placed by the child chain creators if a certain feature is not desired. Unlike “side chains” and other blockchain-related technologies, the Ardor parent chain and child chains like Ignis are based on the same source code and share the same security guaranties. "
What we don't like:
It is hard to understand the value of Ignis on its own. It can be used for payment on the Ardor platform, but so can the Ardor token. If I was interested in purchasing Ignis, I would probably purchase 10 Ardor for every 1 Ignis. Unless Ardor becomes wildly successful, it’s possible having both Ignis and Ardor available will hurt the price of both.
What we like:
Ignis is a huge step for the Ardor platform. It proves that the Ardor platform works, and can have child chains written on it. This is a lot more than most Ethereum competitors can say, as many of them are still ERC-20 tokens.