Triforce's synergy with Skarner is just too good to pass up. Spellblade goes amazingly with his Q, Threefold strike helps Skarner stick to targets with his autos, and the mythic passive gives him some of the best stats he can have(Skarner scales much better with AD than anyone would think, having one of the best AD scaling coefficients in the game alongside Jax and Garen). Next we go titanic hydra to transition into tankiness that Skarner needs for the rest of the game and allow him to keep stacking on more AD that ends up making a huge difference by late game. Last core item is deadman's because of how well the health, move speed, and passive meshes with Skarner's playstyle, though you can substitute with force of nature if magic resist is needed.

Thanks for reading my Skarner build guide! Any questions and/or constructive criticism is greatly appreciated.