Recently I try Zed editor and I love it's AI editing tool. I found Elysium package and give it a try. Then I rebuild it to fit my needs. It quickly expanded to fit all my daily needs and workflow.
So I think someone may find it helpful.

(use-package relysium
:quelpa (relysium :fetcher github
                 :repo "bluzky/relysium"
                 :branch "main"
                 :files ("*.el"))
:hook (prog-mode . relysium-prog-mode))

(straight-use-package
 '(relysium :type git
            :host github
            :repo "bluzky/relysium"
            :branch "main"
            :files ("*.el")))

(add-hook 'prog-mode-hook 'relysium-prog-mode)

Here are the Completed Features

1. Code generation from comments

   • Fully implemented via relysium-generate-from-comments
   • Uses a clear pattern of "AI:" comment markers

2. AI-powered code completion at cursor

   • Implemented through relysium-complete-cursor.el
   • Context-aware with buffer understanding, extends code at current cursor position

3. Code explanation capabilities

   • Strong implementation via relysium-ask.el
   • Allows selecting code regions for specific questions

4. In-chat code editing

   • Core functionality via relysium-edit.el
   • Supports both region-based and cursor-position editing

5. Suggestion system

   • Whole-file analysis and improvement via relysium-suggest.el
   • User-provided instructions for tailored suggestions

Please open an Issue if you found bugs or you have any suggestion.