This DN T4 Destroyer skill build is credited to Opal_蛋白石.

With the lack of up to date builds for Destroyers, I figured I'd share mine. This is more of a reference for those who might be lost on what they would want to invest in skill point wise. It mainly just revolves around what I've been comfortable with so far in terms of nesting and dungeons in general. (You don't have to follow it 100%)

The Build (My current. See below for a better damage alternative build in the Mercenary tree)

For larger size image: Click Here

Brief explanation on some of the skill choices:

(The skill names I'm going by are from the translation patch on this forum)

Warrior:

Tumble, Dash, Aerial Evasion, Strength/Mental Mastery, Mental Training, Brush Off, Surprise Attack: All maxed, for obvious reasons.

Dash Kick, Sweeping Kick, Soccer Kick, Drop Kick: Honestly, the points in Dash Kick was more to reach the 45 sp requirement for the Ultimates. The other 3, I rarely blend together with skills to continue combos.

Highlander: Fail safe skill, might as well grab it just in case of a potential party wipe.

Mercenary:

Stomp: Lv 3 for an even 20% movement reduction.

Flying Swing: Lv 6 for pre-req of Ex. Lv 8 for added damage.

Demolition Fist/Punishing Swing: Both left at lv 1. Just felt there were other more important skills and the damage is still decent.

Swing Circle, Circle Bomber, Whirlwind, Rolling Attack: All maxed. Pretty much my bread and butter attacks in the long run.

Gigantic Bomber: Left at lv 1 for Breaking Point pre-req. Typhoon Wheel is much better.

Typhoon Wheel: Maxed. Suction effect and good damage.

Dash Upper/Soccer Kick Combo: Lv 1. I occasionally come out of dashing with this before chaining skills.

Thorns: Maxed. Passive physical damage reduction.

Iron Skin: Maxed. -60% Damage reduction and Super Armor effect, a must for survival.

Battle Howl: Maxed. Increased damage and critical rate. Also easily maintainable, thus no need for the skill crest now.

Charging Howl: Maxed. Reduce physical and magical damage on you and your party members.

Destructive Scream: Maxed. Nerf target's attack and magic attack power by 50% for 20 seconds, another great skill in parties.

Sober Howling: Lv 2. This was just my preference. I'd rather have the ability to remove 2 debuffs on a boss than 1 (and then waiting 27 seconds to debuff the other buff still on the boss). Up to you as to what lv you'd want it as (if you want it at all).

Destroyer:

Breaking Point: Maxed. On success, it'll be a critical hit and also destroy the target's super armor. Love this passive. Make dungeon bosses dance with Whirlwind/Typhoon. Don't think this works on Nest bosses though... (Correct me if I'm wrong).

Maelstrom Howl: Maxed. Suction effect on casting as well as 70% damage reduction during the cast. High damage, especially with the criticals.

Flying Swind Ex: Lv 1 (Maxed). Turns your Flying Swing into a ranged skill with multiple waves upon release. Damage increased by +20% per shockwave.

My Skill Crests:

Flying Swing Variant Build (Better overall damage):

Skill Bars 1 and 2:

I'll probably add more info later, thanks.