Protects all your other monsters from attacks and targetting spell/trap effects.
Leaves himself vulnerable to effects.
Costly to summon.
Search Belial from your deck when Doomdog Octhros is destroyed. You can use Doom Shaman’s effect to special summon Belial from your hand or graveyard. Belial will then in turn protect Doom Shaman from attacks and targeting effects. You can also use Double Coston or Amarylease to tribute summon this monster with only 1 tribute.
A 2800 stat attack-magnet on the field is good enough to protect all your monsters from battle destruction. To protect them from effect destruction, tribute summon Belial with Hardened Armed Dragon so that Belial would not be destroyed by card effects. You can also have Prime Material Dragon on the field to negate your opponent’s effect destruction.