Which source book would you recommend first after Wayfinder’s Guide to Eberron?

Create Your Own Eberron D&D Adventures @ Dungeon Masters Guild

Is there a chance that the double-bladed scimitar will have the heavy tag added for greater synergy with GWM?

Create Your Own Eberron D&D Adventures @ Dungeon Masters Guild

How I calculate a Warforged barbarian AC with the race from Wayfinder’s Guide to Eberron?

Create Your Own Eberron D&D Adventures @ Dungeon Masters Guild

How would a Warforged’s Integrated Protection feature interact with a Druid’s WildShape?

Create Your Own Eberron D&D Adventures @ Dungeon Masters Guild

How does the Warlock’s Awakened Mind feature overlap with the Kalashtar’s mind link?

Create Your Own Eberron D&D Adventures @ Dungeon Masters Guild

Any advice on what races to give the remaining human marks?

Create Your Own Eberron D&D Adventures @ Dungeon Masters Guild