mods that hopefully work for a TechAge-based pack

mods/mobs_water/mobs_jellyfish/License.txt

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+Licenses
+
+Code: MIT
+Model/Textures:	WTFPL
+Author: blert2112
+
+***************
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+                    Version 2, December 2004
+
+ Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+
+ Everyone is permitted to copy and distribute verbatim or modified
+ copies of this license document, and changing it is allowed as long
+ as the name is changed.
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.

mods/mobs_water/mobs_jellyfish/init.lua

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+
+-- mineclone check
+
+local mod_mcl = core.get_modpath("mcl_core")
+
+-- jellyfish definition
+
+mobs:register_mob("mobs_jellyfish:jellyfish", {
+	type = "monster",
+	attack_type = "dogfight",
+	passive = false,
+	damage = 5,
+	reach = 1.1,
+	hp_min = 5,
+	hp_max = 10,
+	armor = 100,
+	collisionbox = {-0.1, -0.25, -0.1, 0.1, 0.25, 0.1},
+	visual = "mesh",
+	mesh = "jellyfish.b3d",
+	textures = {
+		{"jellyfish.png"}
+	},
+	makes_footstep_sound = false,
+	walk_velocity = 0.1,
+	run_velocity = 0.1,
+	fly = true,
+	fly_in = (mod_mcl and "mcl_core:water_source" or "default:water_source"),
+	stepheight = 0,
+	fall_speed = 0,
+	view_range = 10,
+	water_damage = 0,
+	lava_damage = 5,
+	light_damage = 0,
+
+	on_rightclick = function(self, clicker)
+		mobs:capture_mob(self, clicker, 80, 100, 0, true, "mobs_jellyfish:jellyfish")
+	end
+})
+
+-- Check for custom spawn.lua
+
+local MP = core.get_modpath(core.get_current_modname()) .. "/"
+local input = io.open(MP .. "spawn.lua", "r")
+
+if input then
+	input:close() ; input = nil ; dofile(MP .. "spawn.lua")
+else
+	mobs:spawn({
+		name = "mobs_jellyfish:jellyfish",
+		nodes = {(mod_mcl and "mcl_core:water_source" or "default:water_source")},
+		neighbors = {"group:water"},
+		min_light = 5,
+		interval = 30,
+		chance = 10000,
+		max_height = 0
+	})
+end
+
+-- spawn egg
+
+mobs:register_egg("mobs_jellyfish:jellyfish", "Jellyfish", "jellyfish_inv.png", 0)
+
+-- compatibility
+
+core.register_alias("mobs_jellyfish:jellyfish_set", "mobs_jellyfish:jellyfish")
+
+
+print("[MOD] Mobs Redo Jellyfish loaded")

mods/mobs_water/mobs_jellyfish/mod.conf

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+name = mobs_jellyfish
+description = Adds jellyfish into your world.
+depends = mobs
+min_minetest_version = 5.0

mods/mobs_water/mobs_jellyfish/spawn_example.lua

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+
+-- Jellyfish spawn example
+
+mobs:spawn({
+	name = "mobs_jellyfish:jellyfish",
+	nodes = {"default:water_source"},
+	neighbors = {"group:water"},
+	min_light = 5,
+	interval = 30,
+	chance = 10000,
+	max_height = 0
+})