I wasn't the one who tested it, but another person tested it for me. What he related is that some Necro spells scales poorly with INT, so they actually have a high base damage. Therefore, Warfare/Necro could work well if you pick the Necro spells that apply good effects (like Decaying Touch and Shackles of Pain) and deal high damage with Warfare to destroy the targets physical armor quickly. Also, there is a summon in Necro that raises a blood corpse that explodes, dealing considerable amount of physical damage, without needing much INT or summoning to be effective.
Poly is also a good skill tree if you plan to go to the 1h/shield, 2h or even dual-wielder STR-based build, because all of poly spells scales with STR (some scales with basic attack weapon damage, but since you'd be using a STR weapon...), notably the high-damage Tentacle Lash and the utility Medusa Head (that actually deals earth damage scaling on STR, besides from having a menacing aura).
