Using the command below, you can summon a Glare without any mod or resource pack.

To spawn a Glare, you have to obtain a Glare Spawn Egg. You have to throw a moss block and an egg to the ground to make a Glare Spawn Egg or right-click on the sign on the side of the command box that is written: "[​GIVE EGG]".

Watch on YouTube: https://youtu.be/ePWb64wGRiM
Command on our website: https://torchcraftyt.github.io/Command.html?id=glare

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Triple-click to select all the commands then right-click and choose copy. Next, get in your world, and give yourself a command block (using /give @s command_block). Paste the command in the command block (using Ctrl+C or Cmd+C). Finally, place a Redstone block next to the command block.
*Note: This command is designed to run in Minecraft JavaEditon.
summon minecraft:falling_block ~ ~1 ~ {"BlockState":{"Name":"redstone_block"},"Time":1,"Passengers":[{"id":"villager","Health":0,"Passengers":[{"id":"falling_block","Time":1,"BlockState":{"Name":"activator_rail"},"Passengers":[{"id":"command_block_minecart","Command":"gamerule commandBlockOutput false"},{"id":"command_block_minecart","Command":"fill ~1 ~-2 ~0 ~6 ~0 ~4 minecraft:moss_block"},{"id":"command_block_minecart","Command":"fill ~1 ~-1 ~0 ~6 ~-1 ~4 minecraft:black_stained_glass"},{"id":"command_block_minecart","Command":"setblock ~5 ~-1 ~3 minecraft:repeating_command_block[conditional=false,facing=west]{Command:'/execute as @e[type=item,nbt={Item:{id:\"minecraft:egg\"}}] at @s if entity @e[type=item,nbt={Item:{id:\"minecraft:moss_block\"}},distance=..1] run tag @s add glare-spawn-egg',CustomName:'{\"text\":\"@\"}',LastExecution:765050L,SuccessCount:0,TrackOutput:1b,UpdateLastExecution:1b,auto:1b,conditionMet:1b,powered:0b}"},{"id":"command_block_minecart","Command":"setblock ~4 ~-1 ~3 minecraft:chain_command_block[conditional=false,facing=west]{Command:\"execute as @e[tag=glare-spawn-egg] at @s run particle happy_villager ~ ~.5 ~ 0.2 0.2 0.2 5 10\",CustomName:'{\"text\":\"@\"}',LastExecution:768200L,SuccessCount:0,TrackOutput:1b,UpdateLastExecution:1b,auto:1b,conditionMet:1b,powered:0b}"},{"id":"command_block_minecart","Command":"setblock ~3 ~-1 ~3 minecraft:chain_command_block[conditional=false,facing=west]{Command:'execute as @e[tag=glare-spawn-egg] at @s run kill @e[type=item,nbt={Item:{id:\"minecraft:moss_block\"}},distance=..1,limit=1]',CustomName:'{\"text\":\"@\"}',LastExecution:769192L,SuccessCount:0,TrackOutput:1b,UpdateLastExecution:1b,auto:1b,conditionMet:1b,powered:0b}"},{"id":"command_block_minecart","Command":"setblock ~2 ~-1 ~3 minecraft:chain_command_block[conditional=false,facing=north]{Command:\"execute as @e[tag=glare-spawn-egg] run data merge entity @s {Item:{id:slime_spawn_egg,tag:{EntityTag:{id:marker,Tags:[glare-spawner]},display:{Name:\\\"[{\\\\\\\"text\\\\\\\":\\\\\\\"Glare Spawn Egg\\\\\\\",\\\\\\\"italic\\\\\\\":false}]\\\"}}}}\",CustomName:'{\"text\":\"@\"}',LastExecution:770395L,SuccessCount:0,TrackOutput:1b,UpdateLastExecution:1b,auto:1b,conditionMet:1b,powered:0b}"},{"id":"command_block_minecart","Command":"setblock ~2 ~-1 ~2 minecraft:chain_command_block[conditional=false,facing=east]{Command:\"execute as @e[tag=glare-spawn-egg] run tag @s remove glare-spawn-egg\",CustomName:'{\"text\":\"@\"}',LastExecution:773116L,SuccessCount:0,TrackOutput:1b,UpdateLastExecution:1b,auto:1b,conditionMet:1b,powered:0b}"},{"id":"command_block_minecart","Command":"setblock ~3 ~-1 ~2 minecraft:chain_command_block[conditional=false,facing=east]{Command:\"execute as @e[type=minecraft:marker,tag=glare-spawner] at @s run summon bee ~ ~ ~ {\\\"active_effects\\\":[{\\\"id\\\":\\\"minecraft:invisibility\\\",\\\"duration\\\":999999f,\\\"show_particles\\\":false}],\\\"HandItems\\\":[],\\\"HandDropChances\\\":[1f,1f],\\\"DeathLootTable\\\":\\\"minecraft:empty\\\",\\\"CustomName\\\":\\\"[{\\\\\\\"text\\\\\\\":\\\\\\\"Glare\\\\\\\"}]\\\",\\\"Tags\\\":[\\\"glare\\\"],\\\"Passengers\\\":[{\\\"id\\\":\\\"minecraft:block_display\\\",\\\"block_state\\\":{\\\"Name\\\":\\\"minecraft:azalea\\\",\\\"Properties\\\":{}},\\\"transformation\\\":[1f,0f,0f,-0.5f,0f,0.25f,0f,0.2997f,0f,0f,1f,-0.5f,0f,0f,0f,1f]},{\\\"id\\\":\\\"minecraft:block_display\\\",\\\"block_state\\\":{\\\"Name\\\":\\\"minecraft:azalea\\\",\\\"Properties\\\":{}},\\\"transformation\\\":[1f,0f,0f,-0.5f,0f,-0.5f,0f,0.2372f,0f,0f,-1f,0.5f,0f,0f,0f,1f]},{\\\"id\\\":\\\"minecraft:block_display\\\",\\\"block_state\\\":{\\\"Name\\\":\\\"minecraft:black_concrete\\\",\\\"Properties\\\":{}},\\\"transformation\\\":[0.875f,0f,0f,-0.4375f,0f,0.75f,0f,-0.2628f,0f,0f,0.8125f,-0.4375f,0f,0f,0f,1f]},{\\\"id\\\":\\\"minecraft:block_display\\\",\\\"block_state\\\":{\\\"Name\\\":\\\"minecraft:azalea\\\",\\\"Properties\\\":{}},\\\"transformation\\\":[1f,0f,0f,-0.499f,0f,0f,0.8f,-0.2628f,0f,-0.75f,0f,0.249f,0f,0f,0f,1f]},{\\\"id\\\":\\\"minecraft:block_display\\\",\\\"block_state\\\":{\\\"Name\\\":\\\"minecraft:white_concrete\\\",\\\"Properties\\\":{}},\\\"transformation\\\":[0.25f,0f,0f,-0.3125f,0f,0.1875f,0f,0.1122f,0f,0f,0.001f,0.375f,0f,0f,0f,1f]},{\\\"id\\\":\\\"minecraft:block_display\\\",\\\"block_state\\\":{\\\"Name\\\":\\\"minecraft:orange_concrete\\\",\\\"Properties\\\":{}},\\\"transformation\\\":[0.125f,0f,0f,-0.25f,0f,0.0625f,0f,0.1747f,0f,0f,0.002f,0.375f,0f,0f,0f,1f]},{\\\"id\\\":\\\"minecraft:block_display\\\",\\\"block_state\\\":{\\\"Name\\\":\\\"minecraft:cave_vines\\\",\\\"Properties\\\":{\\\"berries\\\":\\\"false\\\"}},\\\"transformation\\\":[0.75f,0f,0f,-0.375f,0f,0.9659f,-0.1941f,-0.8156f,0f,0.2588f,0.7244f,-0.6612f,0f,0f,0f,1f]},{\\\"id\\\":\\\"minecraft:block_display\\\",\\\"block_state\\\":{\\\"Name\\\":\\\"minecraft:azalea\\\",\\\"Properties\\\":{}},\\\"transformation\\\":[0.75f,0f,0f,-0.375f,0f,0.483f,-0.1941f,-0.5299f,0f,0.1294f,0.7244f,-0.52f,0f,0f,0f,1f]},{\\\"id\\\":\\\"minecraft:block_display\\\",\\\"block_state\\\":{\\\"Name\\\":\\\"minecraft:white_concrete\\\",\\\"Properties\\\":{}},\\\"transformation\\\":[0.25f,0f,0f,0.0625f,0f,0.1875f,0f,0.1122f,0f,0f,0.001f,0.375f,0f,0f,0f,1f]},{\\\"id\\\":\\\"minecraft:block_display\\\",\\\"block_state\\\":{\\\"Name\\\":\\\"minecraft:orange_concrete\\\",\\\"Properties\\\":{}},\\\"transformation\\\":[0.125f,0f,0f,0.125f,0f,0.0625f,0f,0.1747f,0f,0f,0.002f,0.375f,0f,0f,0f,1f]}],\\\"Silent\\\":true}\",CustomName:'{\"text\":\"@\"}',LastExecution:769192L,SuccessCount:0,TrackOutput:1b,UpdateLastExecution:1b,auto:1b,conditionMet:1b,powered:0b}"},{"id":"command_block_minecart","Command":"setblock ~4 ~-1 ~2 minecraft:chain_command_block[conditional=false,facing=east]{Command:\"/kill @e[type=minecraft:marker,tag=glare-spawner]\",CustomName:'{\"text\":\"@\"}',LastExecution:775242L,LastOutput:'{\"extra\":[{\"color\":\"red\",\"extra\":[{\"translate\":\"argument.entity.notfound.entity\"}],\"text\":\"\"}],\"text\":\"[11:25:42] \"}',SuccessCount:0,TrackOutput:1b,UpdateLastExecution:1b,auto:1b,conditionMet:1b,powered:0b}"},{"id":"command_block_minecart","Command":"setblock ~5 ~-1 ~2 minecraft:chain_command_block[conditional=false,facing=north]{Command:\"/execute as @e[tag=glare] at @s on passengers run data modify entity @s Rotation[0] set from entity @e[distance=0,limit=1] Rotation[0]\",CustomName:'{\"text\":\"@\"}',LastExecution:775731L,SuccessCount:0,TrackOutput:1b,UpdateLastExecution:1b,auto:1b,conditionMet:1b,powered:0b}"},{"id":"command_block_minecart","Command":"setblock ~5 ~-1 ~1 minecraft:chain_command_block[conditional=false,facing=west]{Command:\"/execute as @e[tag=glare] at @s on passengers run tag @s add glare-body\",CustomName:'{\"text\":\"@\"}',LastExecution:776643L,SuccessCount:0,TrackOutput:1b,UpdateLastExecution:1b,auto:1b,conditionMet:1b,powered:0b}"},{"id":"command_block_minecart","Command":"setblock ~4 ~-1 ~1 minecraft:chain_command_block[conditional=false,facing=west]{Command:\"/execute as @e[tag=glare-body] run tag @s remove alive\",CustomName:'{\"text\":\"@\"}',LastExecution:777148L,SuccessCount:0,TrackOutput:1b,UpdateLastExecution:1b,auto:1b,conditionMet:1b,powered:0b}"},{"id":"command_block_minecart","Command":"setblock ~3 ~-1 ~1 minecraft:chain_command_block[conditional=false,facing=west]{Command:\"/execute as @e[tag=glare] at @s on passengers run tag @s add alive\",CustomName:'{\"text\":\"@\"}',LastExecution:777734L,SuccessCount:0,TrackOutput:1b,UpdateLastExecution:1b,auto:1b,conditionMet:1b,powered:0b}"},{"id":"command_block_minecart","Command":"setblock ~2 ~-1 ~1 minecraft:chain_command_block[conditional=false,facing=west]{Command:\"/execute as @e[tag=glare-body,tag=!alive] run kill @s\",CustomName:'{\"text\":\"@\"}',LastExecution:778023L,SuccessCount:0,TrackOutput:1b,UpdateLastExecution:1b,auto:1b,conditionMet:1b,powered:0b}"},{"id":"command_block_minecart","Command":"setblock ~0 ~-1 ~1 minecraft:oak_wall_sign[facing=west,waterlogged=false]{back_text:{color:\"black\",has_glowing_text:0b,messages:['{\"text\":\"\"}','{\"text\":\"\"}','{\"text\":\"\"}','{\"text\":\"\"}']},front_text:{color:\"black\",has_glowing_text:0b,messages:['{\"text\":\"\"}','{\"color\":\"dark_blue\",\"clickEvent\":{\"action\":\"run_command\",\"value\":\"give @s minecraft:slime_spawn_egg{EntityTag:{id:marker,Tags:[glare-spawner]},display:{Name:\\'[{\\\\\"text\\\\\":\\\\\"Glare Spawn Egg\\\\\",\\\\\"italic\\\\\":false}]\\'}}\"},\"text\":\"[GIVE EGG]\"}','{\"text\":\"\"}','{\"text\":\"\"}']},is_waxed:1b}"},{"id":"command_block_minecart","Command":"setblock ~0 ~-1 ~2 minecraft:oak_wall_sign[facing=west,waterlogged=false]{back_text:{color:\"black\",has_glowing_text:0b,messages:['{\"text\":\"\"}','{\"text\":\"\"}','{\"text\":\"\"}','{\"text\":\"\"}']},front_text:{color:\"black\",has_glowing_text:0b,messages:['{\"text\":\"Glare\"}','{\"text\":\"Command box\"}','{\"text\":\"Made by\"}','{\"text\":\"TorchCraft\"}']},is_waxed:0b}"},{"id":"command_block_minecart","Command":"setblock ~0 ~-1 ~3 minecraft:oak_wall_sign[facing=west,waterlogged=false]{back_text:{color:\"black\",has_glowing_text:0b,messages:['{\"text\":\"\"}','{\"text\":\"\"}','{\"text\":\"\"}','{\"text\":\"\"}']},front_text:{color:\"black\",has_glowing_text:0b,messages:['{\"text\":\"\"}','{\"color\":\"dark_red\",\"clickEvent\":{\"action\":\"run_command\",\"value\":\"fill ~ ~-1 ~-3 ~6 ~1 ~1 air\"},\"text\":\"[UNINSTALL]\"}','{\"text\":\"\"}','{\"text\":\"\"}']},is_waxed:0b}"},{"id":"command_block_minecart","Command":"setblock ~ ~1 ~ command_block{Command:\"fill ~ ~ ~ ~ ~-3 ~ air\",auto:1}"},{"id":"command_block_minecart","Command":"kill @e[type=command_block_minecart,distance=..1,tag=!debug]"}]}]}]}