The Dungeon Master

Whenever you cast your first spell each turn or
roll a die, venture into the dungeon.
For each differently named dungeon you have completed, The Dungeon Master gains:
1: Hexproof, Indestructible
2: If you would roll one or more dice, instead roll
that many dice plus one and ignore the lowest
roll.
3: At the beginning of each upkeep, venture
into the dungeon.