Add New Pressure Plate Arrow Trap (ER)

Authors: Evanlyn

• DS Map Studio, and basic usage knowledge
• DarkScript 3, and basic usage knowledge
• Yabber (w/ unpacked Elden Ring folder)
• Patience.

Be sure to take notes of all the relevant names and IDs as you go. Make lots of backups.

Be careful not to use any duplicate flags or Entity IDs; regions with duplicate EntityIDs in particular have a chance to permanently corrupt loaded mapbnds, so exercise caution.

Be careful when making Flag IDs; if the fifth digit is 1-9, it will cause the flag to reset on grace/area reload (Eg: XXXX0XXX).

Refer to other Entity or Flag IDs to see how FromSoft formatted them; sometimes it might matter, or not.

If you're curious about most entities having MapID: -1, UnkE0C: 255, and UnkS0C: -1, don't ask me. I have no idea, but changing it can break things. So just keep them that way.

1. Create a new pressure plate asset (eg: AEG027_044). Give it a unique EntityID, and place it where you want it to go.

2. Create a new Enemy entity. Give it a unique EntityID, and the following values:

• UnkC4: -1
• LightSetID: -1
• FogParamID: -1
• MapID: -1
• Unk0C: -1
• Unk14: -1
• ThinkParamID: 1
• NPCParamID: 10003100
• TalkID: 0
• PlatoonID: 0
• UnkT24: -1
• UnkT84: 1.000
• ModelName: c1000 (invisible placeholder model)
• Unk08: 9004
• UnkE0F: 1
• IsShadowDest: Yes
• EntityGroupIDs: Set all to 0
• UnkE3C: -1

3. Create a new Other, Box region. Position it over the pressure plate; you may want to make it slightly bigger to fit the plate. Give it a unique EntityID, and the following values:

• Unk2C: Unique one-to-three digit number
• UnkE08: 255
• MapID: -1
• UnkS0C: -1

4. Create three new Other, Sphere regions. Shrink their radius to around 0.050-0.100. Position them where you want the projectiles to spawn from, and aim them in the correct direction. (The blue axis arrow in Map Studio points forward; use it as reference.) Give them each unique EntityIDs, and the following values:

• Unk2C: Unique one-to-three digit number
• UnkE08: 255
• MapID: -1
• UnkS0C: -1

5. Add a new Event, which will initialize the necessary common event (90005660).

$Event(NewEventID, Default, function() {
    if (EventFlag(57)) {
        InitializeCommonEvent (0, 90005660, EnemyID, PlateID, BoxRegionID, BehaviorID, HoleRegionID 1, HoleRegionID 2, HoleRegionID 3);
    } else if (EventFlag(56)) {
	[Repeat for EventFlags 56-50]
    }
});

Notes: BehaviorID will pick which BehaviorParam the arrows use. There are eight of each; set the eighth value to match that line's EventFlag, as described in the Guillotine Traps section.

Quick reference:

• 8010010×0 = Fire Arrows
• 8010100×0 = Ice Arrows
• 8010200×0 = Lightning Arrows
• 8010320×0 = Magic Arrows

5b. For custom projectiles, duplicate and edit one of the above sets of BehaviorParams in Param Editor. Duplicate and edit referenced BulletParams and AtkParam_NPC entries; be careful everything matches.

6. Initialize the event by adding the following line to Event(0, at the top:

InitializeEvent(0, NewEventID, 0);

7. Congrats.