Your Assault Intercessors, are intended to get close and destroy the enemy in melee. Consequently, they are armed with Astartes chainswords and heavy bolt pistols. Other than the sergeant, they have no weapon options. ... Thunder hammers and power fists are your best alternate melee weapon.

Can Intercessors take melee weapons?

Yes, they can. Since there are models for an Intercessor Sgt without a rifle, the rules allow you to either replace the rifle with a melee weapon or to add a melee weapon to the model while keeping the rifle. However, it cannot have two melee weapons.

What can an intercessor sergeant be equipped with?

"The Intercessor sergeant can be equipped with one of the following instead of 1 bolt rifle, 1 auto bolt rifle or 1 stalker bolt rifle: 1 chainsword; 1 hand flamer."