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Stop Vhaelon's Bastion siphon - AI-generated fantasy Encounter

Stop Vhaelon's Bastion siphon

Encounters
Protect · Moderate · 6 players, level 14

Stop Vhaelon's Bastion siphon

Every round the ritual continues past round 5 risks stripping a Bastion's passive defense.

Run the fight

Round
1
4 to 6 rounds
Creatures
3
Moderate

This round

Nothing planned.

Win Vhaelon is defeated or the central circle is disrupted

Lose Vhaelon completes the ritual or the party is forced to abandon the chamber while the siphon continues

Party 6 players, level 14

System D&D 2024

Cheat sheet

Protect

Stop Vhaelon's ritual before the siphon disables the Bastions' defenses; defeat him or disrupt the central circle.

Win

Vhaelon is defeated or the central circle is disrupted, ending the ritual.

Lose

Vhaelon completes the ritual or the party is forced to abandon the chamber while the siphon continues.

If it goes badly: Vhaelon retreats through a prepared teleport route if the ritual is disrupted and he is near defeat; the helmed horrors cover his escape.

Forces

  • 1 × Arch-Scribe VhaelonAC 17 · HP 245 · CR 18
  • 2 × Helmed HorrorAC 20 · HP 60 · CR 4

Rounds

  • 5+Beyond round 5, the siphon temporarily disables one random active Bastion's passive defensive boon.
  • 5Dragon-Rider or Tide-Caller allies delay the first siphon effect by 1 round; if the party has at least 10 VP and earned either support, delay it by 2 rounds instead.

Read aloud

Say this

Vhaelon drives his staff into the circle, and all six altars flare in answer. Two helmed horrors step across the leyline channels, blades raised. The ward-stone cracks beneath your feet as the ritual starts pulling power from the Bastions.

Forces

2

  • Arch-Scribe Vhaelon

    Controller

    1 of them
    AC
    17
    HP each
    245
    CR
    18

    Legendary Resistance (3/Day) · Chronal Resilience · Spellcasting

    Opens
    Cast a control spell to split the party, then keep the circle between himself and melee attackers.
    Targets
    A character attempting to seize or destabilize an altar.
    Flees
    Flees if reduced below 25 hit points and the ritual is disrupted.
    Open the monster

  • Helmed Horror

    Bruiser

    2 of them
    AC
    20
    HP each
    60
    CR
    4

    Magic Resistance · Spell Immunity · Magic Weapons

    Opens
    Move to block access to the nearest altar and attack anyone moving toward it.
    Targets
    The closest character interfering with an altar or the circle.
    Flees
    Fights until destroyed.
    Open the monster

What happens

4 to 6 rounds
  1. 5+

    At the end of each round after round 5, unless Dragon-Rider or Tide-Caller support delays the siphon.

    Beyond round 5, the siphon temporarily disables one random active Bastion's passive defensive boon. Each successful altar intervention removes one eligible target from Vhaelon's Siphon Resonance.

  2. 5

    At the end of round 5, if the party earned the relevant support.

    Dragon-Rider or Tide-Caller allies delay the first siphon effect by 1 round; if the party has at least 10 VP and earned either support, delay it by 2 rounds instead.

  3. ·

    Before initiative, a character spends one minute investigating and succeeds on a DC 18 Intelligence (Arcana or Investigation) check.

    On a success, reveal which altar Vhaelon is drawing the most power through.

The battlefield

Zones

  1. 1

    Central circle25 ft

    The central circle glows under Vhaelon's ritual. Ward-stone fragments provide half cover.

  2. 2

    West altars25 ft

    Ignis, Aqua, and Terra stand 30 feet from the circle; pillars and broken stone break sightlines.

  3. 3

    East altars25 ft

    Aer, Lux, and Umbra stand 30 feet from the circle beside exposed leyline channels.

What the party can use

An action and DC 17 Intelligence (Arcana) check can destabilize or claim control of one altar; each altar can be intervened with once.
A creature behind a pillar or broken ward-stone has half cover.
Exposed leyline channels cross the floor; a creature shoved into one takes 2d6 force damage.

Scaling

XP budget22,200 of 37,200 XP
Weaker

Moderate

One fewer Helmed Horror

Remove one helmed horror; the ritual does not begin siphoning until round 7.
As written

Moderate

Stronger

High

One more Arch-Scribe Vhaelon

Add one helmed horror; Vhaelon begins with greater invisibility already active.

Treasure

Vhaelon's ritual notes identify the altar he favored and the next steps of the Shattering at Dawn.

Media

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