Although the Fusion monster Fiend Skull Dragon can be Fusion Summoned using Lesser Fiend and Cave Dragon, it is not recommended to use Fusion tech cards together with Archfiend support due to lack of consistency.
Call of the Archfiend is a very powerful continuous Trap that can revive your high level Archfiend monsters from the Graveyard to the Field, by discarding any Fiend-type monster as cost. Trance Archfiend can activate its effect to discard Lesser Fiend from your Hand to the Graveyard, in order to be Special Summoned with Call of the Archfiend. Archfiend Cavalry can Special Summon Lesser Fiend from your Graveyard when it was destroyed by a Card effect. Archfiend Roar can Special Summon Lesser Fiend from the Graveyard at the cost of 500 Life Points.