Grandparent

The Grandparent is a new Boss Monster introduced in the Anniversary Update of Risk of Rain 2. Being a Boss, the Grandparent may be encountered after initiating a stage's Teleporter Event. It can otherwise spawn naturally during higher difficulties.

Environments

 * Sky Meadow

Rock Throw
The Grandparent throws a large rock at a player, causing heavy damage and heavy knockback on impact. The rock will be destroyed if it comes into contact with any solid obstacle.

Gravity Orb
The Grandparent spawns a slow-moving orb that moves toward a player for a moderate duration. Any player caught in its gravity well will be pulled toward the orb. This orb (and its gravity well) can pass through all obstacles. Players should avoid being caught by these orbs in certain levels as they can result in being dropped into bottomless pits.

Solar Flare
At 50% health and below, after a brief delay the Grandparent creates a large sphere resembling a star above its head. Any entity (both players and enemies) caught in its large AoE that does not have direct cover between them and the star receives a stacking Overheat debuff and is set on fire. This debuff increases fires damage, causing it to quickly drain health. For this reason, it is generally best to focus attacks on one Grandparent at a time. The attack lasts for 14 seconds, inflicting 27-28 stacks of Overheat (inflicts one every 0.5 seconds, refreshing the stack), and 2-3 stacks of fire at a time (fire stacks don’t get refreshed).

Loot
Main Article: Planula

If the Grandparent is the Teleporter Boss, there's a chance the Uncommon item you would get as a reward for defeating the Teleporter Boss could be replaced by its Boss item,.

Trivia

 * Prior to the Anniversary Update, an early version of the Grandparent was left unused within the game code with a vastly different appearance and skill set.
 * The Grandparent more closely resembled a large, misshapen, two-headed that was partially submerged in the ground. It would create teleportation fields to catch the player and bring them within striking distance, as well as spawn eggs from which Parents would eventually emerge.
 * The Grandparents spawn animation will launch players within it at a high velocity, in most cases off the map, so be careful when it is spawning.
 * The spawn animation itself deals no damage, but can indirectly hurt you via fall damage or launching you into another attack.