This boss can be found in any tier.
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Encounter Details
Every red treasure box would have a 10% chance of being replaced with a purple treasure box. Purple treasure boxes would have the same rewards as a red box, but also dropping a Mysterious Crystal (other items are also possible - I'll have to think about what the other drops could be, though). In every Clockwork Tunnels, there would be a 7% chance of a crystal room to contain a red crystal built into a wall. If a player goes near it, a message will appear: "This crystal isn't like any of the others here. It appears to have a slot for something..." If a player clicks while near it, there are 2 things that can happen - It'll either send an energy blast, knocking away the player (not damaging though), or fall into the ground. The crystal will be marked on the minimap after being discovered. When removed/triggered, the minimap mark will remain, but will change to show that the crystal is opened.
Energy blast: Happens when the player has no Mysterious Crystal or hasn't defeated the Crystal Guardian in the previous tier (e.g. the player has to destroy the T1 Guardian to be able to remove the crystal in T2).
Fall/disappear: Happens when the player has a Mysterious Crystal and has defeated the previous tier Guardian (unless this is in tier 1). It uses up the MC, so you'll have to find another one if you encounter the crystal a second time. It leaves a glowing hole in the wall. This will act similarly to the elevator, moving him to the boss floor. If the player is in a party, he can go on ahead without the rest of his party, similarly to how it is in Moorcroft Manor/Emberlight, though party members can't join him again once he leaves the spawn room. When all players are in the crystal's opening, there will be a message that says that advancing will lead to a boss battle and that the party will be locked when entering until they leave the boss floor.
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Battle
Tier 1: There will be walls on all sides with no gates except behind you. On the wall directly in front, a crystal eye will appear. On the sides will be floating crystal wing-like objects, with some crystals floating in front. The wings can be destroyed, while the eye is invulnerable until both wings are destroyed. The Guardian will switch between 2 attacks -
Attack 1: The crystals next to the wings will shoot in a straight line in random directions, going at somewhat fast speeds, exploding when they hit a wall. They respawn (and shoot at you again) after 1 second.
Attack 2: The crystals will fly away from the wings, going into several locations on the battlefield. These don't hurt you, and only interrupt movement. The eye will move to one side and shoot a laser, then move to the other side. It'll stop directly before hitting the opposite wall, so the player is safe if he/she goes there. The laser goes through the crystals, so you can't hide behind them. This will immediately start again, but from the opposite wall it started last time. After the laser is fired twice, it'll switch to attack 1 again.
After 1 wing is destroyed, the crystals will turn green and fly to the other wing, shooting green healing lasers. These can all be destroyed, and will only heal the wing, not each-other. The crystals fired in attack 1 will respawn in 0.7 seconds instead of 1 second. The healing crystals won't respawn.
After the other wing is destroyed, the crystals from it will turn green and heal as well. The eye will be able to be damaged. All crystals will fly to and start healing the eye. Because the wings are gone, the only attack used will be attack 2, but it will be much faster because there won't be any barriers to slow the player. After the eye is destroyed, part of the wall will explode, and the player can open treasure boxes and get a special material.
Tier 2: The crystals will turn blue and bump away the player when touched during attack 2. The crystals in attack 1 will respawn in 0.7 seconds with both wings, and in 0.5 seconds when one wing is destroyed. (This tier section is incomplete)
Tier 3: will be done later
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Boss Rewards
will be done later
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Art
Purple Treasure Box:
Mysterious Crystal: http://i.imgur.com/MMircVo.png
Crystal Barrier/Slot:
"Wing" (T1):
Crystal (T1, normal):
Crystal (T1, healing):
Eye (T1, shielded): http://i.imgur.com/AdCLx1e.png
Eye (T1): http://i.imgur.com/x6PKKvh.png
Material drop (T1):
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Other Notes
The Mysterious Crystal is a 1* material.
Mysterious Crystals aren't bound when obtained and can be traded.
The boss isn't really any particular monster type, but is resistant to piercing damage. It has no weaknesses.
sense it's a crystal sort of monster, i was thinking the more it gets damaged, the more it will chip down until it becomes a small crystal like the minerals we pick up on the clockwork until we kill it. I think that would be a good feature.