Rune Archdragon

The rune dragon is aware of any active magical abilities and effects within the listed range. When the dragon Seeks, it gains the benefits of a 4th-rank Detect Magic spell on the things it sees within the listed range (in addition to the normal benefits of Seeking).

The rune dragon's scales function as runestones. The rune dragon can't use the effects or abilities of the runes etched on its scales, but can transfer these runes to appropriate objects. Transferring a rune to or from an item in this way requires 1 minute to complete, during which the dragon is Off-Guard. The process is automatic and doesn't require a check, but if the dragon stops or is interrupted in this process, the rune is destroyed. A rune dragon can have any number of runes etched on its

Trigger The dragon is the target of a spell that requires a saving throw

Effect The dragon attempts to unmake the spell's foundational runes. They attempt to counteract the spell (counteract rank 10, counteract modifier ). If successful, the dragon is unaffected by the spell; other subjects are affected by the spell normally. The dragon can't use canceling rune again for .

Trigger A creature within 15 feet damages the rune dragon

Effect With a burst of runic magic, the rune dragon creates a detonating rune on the triggering creature and immediately causes it to detonate if it didn't automatically do so.

The rune dragon gains an additional reaction at the beginning of each of their turns that they can use only for a Retributive Rune.

The rune dragon's Strikes and abilities can leave a detonating rune on their targets. If a creature would receive a detonating rune while they already have one, instead of adding another rune, their current detonating rune activates, dealing 8d6 untyped damage to the target and expending the rune. The detonating rune's damage type matches the dragon's current Shifting Rune. A creature can use an Interact action to remove the rune. Detonating runes fade after 1 minute if not detonated.

The dragon makes two claw Strikes and one tail Strike in any order.

The dragon recharges their Runic Breath whenever they score a critical hit with a Strike.

The rune dragon creates large trapping runes in 3 non-overlapping 15-foot bursts within 60 feet. Creatures other than the dragon that enter a trapped space or end their turn in the trapped space activate the rune, causing it to entangle the creature. The creature must attempt a DC 46 reflex save or become Immobilized for 1 minute or until it Escapes. The rune can only trap a single creature at a time. The rune vanishes either when a creature succeeds against the rune, when a creature successfull

The dragon launches hundreds of exploding runes that detonate upon impact, dealing 20d6 untyped damage in a 60-foot cone (DC 46 reflex save). The damage type of this ability is determined by Shifting Rune. Creatures that take damage from the breath also gain a detonating rune. The dragon can't use Runic Breath again for .

The rune dragon chooses between acid, cold, electricity, fire, or sonic damage. The runes etched upon the dragon shift, forming runes of that energy on their scales. The dragon gains immunity to that damage type, and their detonating runes and Runic Breath deal that damage type. Anyone trained in Arcana can immediately recognize the energy type of the etched rune without a check.

The rune dragon Strides, leaving behind a collection of runes wherever it steps. The dragon chooses to leave behind either detonating runes or entangling runes. Every space that the dragon moves through, including spaces occupied by creatures, gains a rune. These runes automatically activate when a creature other than the rune dragon enters the space or ends its turn in the space. The runes can otherwise be removed or vanish like normal.