The Dom saradomin brew is a possible reward from the Dominion Tower. It functions just as a regular two-dose Saradomin brew and can only be used inside the tower.
Dominion potions can also be exchanged at the Reward box for an experience reward.
Trivia
- Before the 20 July 2015 update, when you tried to pour a dominion tower saradomin brew into a potion flask it would cause a disconnect.
.png){kind=link}
.png){kind=link}