Question: I'm interested in writing a fantasy novel, are there any AI-powered tools that can assist me in building my world and characters?

If you want some AI-powered tools to flesh out your fantasy world and characters, NovelAI is a good option. This subscription-based service uses AI for storytelling and world-building, with tools like character visualization, a text adventure module and a customizable editor. It also comes with a lorebook for recording world-building details and a variety of AI modules to write in a particular style. It's available on several pricing tiers, including a free trial.

Another tool worth checking out is StoryNest.ai, which offers a variety of AI tools for crafting compelling stories, novels and interactive stories. It includes character creation and chat, world-building tools and AI-boosted editing and proofreading. It can handle multiple formats, including interactive fiction and scripts, so it should be adaptable to whatever kind of writing you want to do. You can try it with a free trial.

Novelcrafter is a full-featured writing environment with a personal Wiki to store story details, multiple writing modes and AI tools to help you along the way. It's got outlining tools, revision history and customizable tags so it should work for both planners and pantsers. Novelcrafter also lets you control AI context and prompt settings so you can adapt to your writing style.

If you're looking for a tool geared more toward writer's block and overall writing process, Sudowrite could be a good option. It uses large language models like GPT-3 and GPT-4 to generate ideas, create outlines, write drafts and edit. Sudowrite's tools include options like Describe, Story Bible and Rewrite that can help you get past a creative block and be more productive. It offers a variety of pricing tiers and a free trial, so it's available to writers at different levels.