Block:
Lvl 6. Because for me It's one of the more usefull skills that cleric has, at lvl 6 can protect you from 7 hits. (Usefull if last boss in Apocalypse start spinning right at you).
Sliding Step:
Max Lvl. Usefull to dodge attacks in pvp/pve low cooldown at lvl 5.
Heal:
Lvl 9. Usefull and recover a great ammount of HP at max lvl, and It's a good support for your team members.
Aerial Evasion:
Lvl 4. The difference with lvl 3 It's not that much.
Holy Cross:
Lvl 12. Max signature skill for Crusader!
Provoke:
Lvl 3. You'll need it at lvl 4 to provoke all the time, but lvl 3 is alright for me.
Auto Block:
Lvl 1. Really low % to activate on higher lvls only lvl 1 to learn next skill in the paladin tree.
Sacred Hammering:
Lvl 3. Only lvl 3, allow you to do 3 normals attack instead of 1. You need it at lvl 3 to learn Lighting Charger.
Sin Breaker:
Lvl 2. You need to learn Armor Break, basic skill in pvp if you want to start your combo.
Stance of Faith:
Lvl 5. This buff is really usefull in pve to tank as a Crusader/Guardian is a most have, really usefull.
Armor Break:
Lvl 10. This skill is one the best skill in Paladin skill tree, low cooldown, good damage and reduces physical def from mobs/bosses.
Lighting Charger:
Lvl 3. Lighting Charger had a huge nerf, allowing you to only hit 5 targets, still does good damage on pvp and bosses.
Elemental Aura:
Lvl 2. You'll need it to support your team in SDN.
Smite:
Max Lvl. The strongest skill that Paladin has besides Divine Avatar. Is a most have obviosly so I choose to go all the way with it so I max it.
Shield Charge:
Lvl 1. You only need this skill to chase people in pvp and mobs or bosses in pve, the damage It's ok.
Will of Iron:
Lvl 1. You can choose either learn it at lvl 1 or no, and just for directly for Divine Avatar.
Conviction Aura:
Lvl 2. This buff increase The Lighting attack and resist for you and all your team members.
Thor's Hammer:
Lvl 40 Ultimate Skill, It's not the best compared to Divine Avatar but you will need it to learn skills in Crusader skill tree.
Divine Avatar:
Previosly you couldn't learn it because of the restriction with the last update you can go Crusader and have it!. :D
Crusader skill tree:
Doesn't need explanation learn all the 3 skills.
This have been updated to the last update where you can learn both Ultimates, the 10 sp left are to learn Divine Avatar.