Packet Play Client Boss Bar

Version	ID
1.9	0x0C
1.15.2	0x0D

1.15.2

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0D	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music), 0x04: create fog (previously was also controlled by 0x02)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.14.4

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music), 0x04: create fog (previously was also controlled by 0x02)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.13.2

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music), 0x04: create fog (previously was also controlled by 0x02)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.13.1

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music), 0x04: create fog (previously was also controlled by 0x02)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.12.2

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.12.1

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.12

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.11.X

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.11

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.11

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.10

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.9.3

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.9.2

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

1.9

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
			4: update style	Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above