1.
With artifacts (mainly).
2.
Through education (here, Gnomes have an advantage with 8%, while Orcs have 2%).
3.
With Gnomes, learn light and mass spells, and with Orcs, learn battle cries...
For relic artifacts, you can sacrifice something if they are guarded by phoenixes or creatures of level 7, plus Utopia, and all the houses that give artifacts and skills.
