See this 14 page PDF. Not perfect and not complete, but I believe it’s playable. Text in quotes is text from Frostgrave which I’ll rewrite. Text in italics are reference notes to explain my thinking.
- Monster spawning location rules (need better rules)
- Weapon & Spell Ranges (should 5e’s be modified?)
- HP growth over time (will high level PCs be an issue?)
- AoE templates (should 5e’s be modified?)
- Falling rules (how to push and damage)
- Are there spells like Telekinesis or Mage Hand that could break the Treasure mechanics?
Future Rules / Content It Needs
- Treasure Tables
- Creatures Random Encounter Tables
- Campaign Scenarios
- Advice on running solo games (players plays 2 warbands and 2 characters).
- Advice on scaling game up or down based on number of players
- Home Base rules like Frostgrave
- Pregen PCs
- NPC/Hireling Cards and/or Warband Character Sheets