Tower tactics.

How do you like Rissa as a starting hero for the Tower faction?
After all, one of the most pressing problems is finding resources to build mages and nagas. If you take the pearl bonus and Rissa at the start, then the issue with two resources is solved; you just need to obtain crystals and sulfur from neutral creatures. This saves time and prevents heroes from being stretched thin when these resources are scarce. Plus, Rissa also has attack, mysticism, and archery in her spellbook.