Sorry my writing in english is bad, i'm a french canadien.

I just wish to report a case, it not realy a bug, but it make explosion to powerfull. You can use explosion for free when you use at low power, and it still make damage to monsters.

Here 2 exemples spells:

That a spell on a sword, it one shot every creature outside for free, chicken and enderman are a exception. You can create that spell at lvl 15.
{spellName:"Explosion Sword",uuidMost:-8569485740787020663L,validSpell:1b,spellList:[0:{data:{params:{_power:2,_position:4},key:"trickExplode"},x:3,y:4},1:{data:{key:"constantNumber",constantValue:"0.01"},x:3,y:5},2:{data:{key:"selectorAttackTarget"},x:4,y:3},3:{data:{params:{_target:1},key:"operatorEntityPosition"},x:4,y:4},4:{data:{params:{_power:3,_position:1},key:"trickExplode"},x:4,y:5},5:{data:{params:{_power:2,_position:3},key:"trickExplode"},x:5,y:4},6:{data:{key:"constantNumber",constantValue:"0.01"},x:5,y:5}],uuidLeast:-6375705419479733523L}

There a spell that you put on a "loopcast spell bullet", it will kill every ennemy arround you and it free. It beter to be outside, but enemy will took little damage anyway, so event inside it could be usefull. You can create that spell at lvl 12, i think.
{spellName:"Boom Away",uuidMost:-722487066750270759L,validSpell:1b,spellList:[0:{data:{key:"selectorCaster"},x:3,y:3},1:{data:{key:"constantNumber",constantValue:"0.001"},x:3,y:4},2:{data:{params:{_power:1,_position:4},key:"trickExplode"},x:3,y:5},3:{data:{key:"errorSuppressor"},x:4,y:2},4:{data:{params:{_target:3},key:"operatorEntityPosition"},x:4,y:3},5:{data:{params:{_target:4,_position:1},key:"operatorClosestToPoint"},x:4,y:4},6:{data:{params:{_target:1},key:"operatorEntityPosition"},x:4,y:5},7:{data:{params:{_target:3},key:"connector"},x:5,y:3},8:{data:{params:{_position:1,_radius:2},key:"selectorNearbyEnemies"},x:5,y:4},9:{data:{key:"constantNumber",constantValue:"24"},x:5,y:5}],uuidLeast:-7021581280121233831L}

For me it make no sence that a spell like those cost nothing. The minimum power for breaking a dirt block is 0.15 and it cost 10. It usefull to put a low power value to explosion, at lower level it make explosion be use as a shovel, I know it a vanilla bug, but perhaps puting a minimum cost to that trick, so we cant abuse it so easily?