Hi every one!
Hey I'll show you some commands for commandblocks if you like commandblocks
and will make a project!
ONLY IN VANILLA MINECRAFT!
Here is the commands:

what you want to call it it's a mob
/summon Skeleton ~ ~1 ~ {Equipment:[
{id:261,tag:{ench:{id:50,lvl:1}]}},
{id:301,tag:{display:{color:0}}},
{id:300,tag:{display:{color:0}}},
{id:299,tag:{display:{color:0}}},
{Damage:3,id:397,tag:{SkullOwner:dragnoz­}}],
CustomNameVisible:1,CustomName:"sirjavlux"­}

skeleton boss/what you want to call it
/summon Skeleton ~ ~1 ~ {Equipment:[
{id:261,tag:{ench:{id:50,lvl:1}]}},
{id:313,tag:{ench:[{id:2,lvl:2}]}},
{id:312,tag:{ench:[{id:3,lvl:2}]}},
{id:311,tag:{ench:[{id:7,lvl:2}]}},
{id:310,tag:{ench:[{id:4,lvl:2}]}}],
CustomNameVisible:1,CustomName:"Not Bob"}

minions/what you want to call it
/summon Zombie ~ ~1 ~ {Equipment:[
{id:276,tag:{ench:{id:16,lvl:2}]}},
{id:301,tag:{display:{color:0}}},
{id:300,tag:{display:{color:0}}},
{id:299,tag:{display:{color:0}}},
{Damage:3,id:397,tag:{SkullOwner:sirjavlux}}],
CustomNameVisible:1,CustomName:"minions"}

Tp
/tp @p x y z

xp taker
/xp -4L @p[ml=4,r=6]

cmd sensor:
/testfor @p[r=2]

kill arrowz:
/kill @e[type=Arrow]

smoke:
summon Slime x y z {Size:-1}
summon Slime ~ ~1 ~ {Size:-1}


portal
/tp @p[ml=0,l=99,r=2]

Gamerules:
/gamerule doFireTick true/false
/gamerule keepInventory true/false
/gamerule doMobLoot true/false
/gamerule doMobSpawning true/false
/gamerule doTileDrops true/false
/gamerule mobGriefing true/false
/give @p[r=2] 274
/gamerule keepInventory true/false
/difficulty 0/1/2/3
/toggledownfall
/xp 2L @p(2 levels) or /xp 2000 @p (2000 points)