Crystal Geod Seraph

Earth Glide: The Crystal Geod Seraph can burrow through nonmagical, unworked earth and stone. While doing so, the Crystal Geod Seraph doesn't disturb the material it moves through.

Reverbertating Crystal: Whenever the Crystal Geod Seraph is affected by a sound based effect the effect is recast centered on it with in all directions with its range halved and only once per attack or effect.

The Crystal Geod Seraph is not immune to these effects however.

Earthen Regeneration: The Crystal Geod Seraph regains 50 hit points at the start of its turn, however it only regains this hit points while in direct contact with a large area of stone, crystals or earth.

Magic Resistance: The Crystal Geod Seraph has advantage on saving throws to avoid spells and spell like effects.

Magic Reflection: Whenever the Crystal Geod Seraph is affected by a spell of 6th level or lower the caster must roll a d6, on a 4 or 5 the spell fails to affect the Crystal Geod Seraph on a 6 the spell is reflected towards the caster, being recast targeting it or with it as the center of the spell area if possible.

Radiance Surge: Whenever the Crystal Geod Seraph would take radiant damage it instead reflects that damage (this effect hapens before damage calculation ignoring effects that would ignore resistance or immunity to radiant damage), all creatures within 60ft of the Crystal Geod Seraph must succeed in a DC 24 Constitution saving throw taking radiant damage equal to half of the damage that would have been dealt to the Crystal Geod Seraph instead.

Clear Body: The Crystal Geod Seraph is immune to any unwilling alteration of its body, such as spells and spell like effects that would alter its shape like the polymorph spells, effects that would break or wound it, or effects that would otherwise add additional material on its body.

Ore Form: Attacks made with pick axes against the Crystal Geod Seraph score a critical hit on a roll of 18-20.

Pick axes that target the Crystal Geod Seraph ignore piercing damage resistance.

Crystal Resilience: The Crystal Geod Seraph only takes damage if it takes 25 damage or more.

Attacks made with pickaxes ignore this effect.

Siege Monster: The Crystal Geod Seraph deas twice as much damage to structures.

Multiattack: The Crystal Geod Seraph makes four attacks on its attack action or two attacks and one additional available action.

Crystal Slam: Melee Weapon Attack +16 to hit, 15ft reach, all creatures within a 10ft cube, for 3d8+4 piercing + 3d8+4 slashing damage.

Reflection Shard: Ranged Spell Attack +16 to hit, 240ft radius, one target, for 8d6+8 radiant damage.

Reflection Beam (Recharge 5-6 or whenever radiant damage would have been taken): All creatures within a 240ft long 10ft wide line centered on the Crystal Geod Seraph must succeed in a DC 24 Dexterity saving throw taking 8d6+8 radiant damage on a failure.

Crystal Nova: All creatures wtihin 120ft of the Crystal Geod Seraph must succeed in a DC 24 Dexterity saving throw taking 3d8+4 piercing + 3d8+4 slashing + 3d6+4 radiant damage on a failure half as much on a success.