So been playing for about a day, I know I know not long at all, just want to know who to focus more on to level and ascend, any rares just "trash" that I can just use as feeder

Epic:

4* Thenasil

Rare:

4*Elhain (full 4* ascended)

4* Sorceress

3* Graybeard

3*Warpriest

3*Valerie

3*Heiress

3*Coldheart

3*Magmablood

3*Ironclad

3*Hospitaller

3*Pounder

3*Gator

3*Spikehead

3*Rocktooth

3*Halberdier

Thanks in advance